Best Pipe Thread Sealant Dope

Best Pipe Thread Sealant for Leaky Pipes (Pipe Joint Compound)

Pipeline installation is very easy when you’ve got the best pipe thread sealant!

Whether setting up pipe joints for natural gas, water lines, brass fittings, or whatever, select the pipe joint compound with extreme caution. Regardless of how good you are, there will always be imperfections when setting up pipe joints.

A plumber already knows that FOR SURE!

Such imperfections include microscopic crevices that are left between the pipe threads. And they can be very dangerous. Especially if you put harmful chemicals in the pipeline. Not to mention other dangers like natural gas leaks in case you do it improperly!

So, how do you solve the headache? Worry not!

Our list of the 13 best pipe joint compounds CAN BE A VERY POWERFUL TREATMENT!

Besides eliminating those issues, they will protect the threads from further damage. So, let’s get right into business! And here’re our top five choices below –

Image Name Our Rating Price
Original NYLOG BLUE Thread Sealant

5 out of 5

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Permatex Pipe Thread Sealant for High Temperature

5 out of 5

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Rectorseal Pint Brush T-Plus-2 Pipe Thread Compound

4.5 out of 5

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OATEY Pipe Joint Compound with PTFE

4.5 out of 5

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PLS2 Premium Pipe Thread Sealer and Dope

4 out of 5

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To read about our product selection procedure, visit the “About” page.

Best Pipe Thread Sealants or, Pipe Dope Reviews

Are you installing new pipelines or perhaps repairing any old plumbing fixtures? And looking for the best pipe thread sealer compound recommendation? Consider using our top pick, Original NYLOG BLUE Thread Sealant. It’s a wonderful thread sealer.

Or, you might also have a look at others as well.

In total, there are 13 products we’ve covered. And they are the market leaders today! When applied, they’ll leave you to forget the confusing and risky pipe joints. That way you throw the complaint into the dust.

Read more: Best Threadlocker Reviews

1. Original NYLOG BLUE Best Pipe Thread Sealant

It’s hard to join 2 pieces of galvanized, PVC pipe, or brass without using a thread sealant, right? Otherwise, the joint between the 2 hose fitting will leak. Why not just make the joint leak-free with this Nylog Blue sealant? An elastic fluid from refrigeration Technologies!

This NYLOG blue product is designed for HFC refrigerants. Yet the manufacturer claims that it’s a universal sealant since it has been approved for 410A. As such, you can use it for various applications! To give you an example, this is one of the best PVC pipe sealants you’ll ever find.

What makes Nylog Blue unique?

Simple! This product is derived from synthetic refrigerant-grade lubricants. Therefore, with this sealant, you’ll not experience contamination or compatibility issues. In other words, it’s fully compatible and miscible with all system oils and refrigerants.

Also, applying this sealant is very simple. Just apply a small sealant amount on the threads and the fitting. Even better, it does not crack, dry, or even become heat-fixed to the pipe surface! Besides, it’s one of the best thread sealant for PVC that’ll protect the pipe from leaking out.

The product is available in a convenient 30 ml bottle. Its top twist opens dispensing small amounts of the sealant with ease. If some sealant gets on your tools or hands, just wipe it off with a cloth. To form a vacuum seal that will block high-pressure leaks, this is the sealant you should consider!


  • Doesn’t contaminate systems
  • Seals threaded connections & flares
  • Compatible with every refrigerant


  • Made by: Refrigeration-Technologies
  • Designed for HFC refrigerants
  • Weight: 0.8 ounces
  • Size: 30 ml bottle

2. Permatex Pipe Thread Sealant for High Temperature

Tired of messing with pipe dopes and tapes? Then this Permatex thread sealant might be just what you need! It’s a rapid-use thread sealant designed for various applications. You can use it for tapered thread fittings and metal.

Also, apply it in case of replacing both pipe dopes and Teflon tape.

Why Permatex Thread sealant?

This product prevents galling and protects threaded areas from corrosion and rust. Not to forget that it can withstand a pressure of up to 10,000 psi.

Permaflex sealant also contains PTFE (popularly known as Teflon). However, unlike traditional Teflon tapes, it doesn’t wear or shred.

Furthermore, it maintains contact with the pipe threads throughout the fitting process. Also, once you apply this sealant, you can still reposition the parts after about 4 hours! It also lubricates threads to enhance convenient disassembly and assembly.

Hence reducing the chances of stripping, rounding, and snap fasteners.

Because of its hi-tech formulation, this sealant seals and locks threaded fittings. Thus allowing it to prevent leakage and vibration loosening. We have to remind you how such leakages can be costly and time-consuming to rectify!

You’d love to know that its effective temperature range is between -54 and 204°C. This enables it to withstand extreme weather conditions and under-bonnet temperatures. That, plus its OEM quality, makes it a popular option in most automotive factories.

So, if professionals use Permaflex, why not you?


  • Specifically designed for meta & tapered pipe thread fittings
  • Solvent & temperature resistant
  • Best for emergencies
  • Fast curing
  • Contains PTFE


  • Manufacturer: Permatex
  • Withstands high pressure
  • Weight: 2.72 ounces
  • Size: 50 ml bottle
  • Color: white

3. Rectorseal Pint Brush T-Plus-2 Pipe Thread Compound

For professional use, consider investing in this thread sealer compound by Rectorseal. It’s a leading manufacturer of premium-grade chemical specialty sealants and other products. Their Rectorseal T Plus 2 sealant contains synthetic fibers and PTFE.

Thus ensuring maximum sealing performance!

This is after the dispersed fibers in the resinous base combine with the inert mineral fillers.

Besides, this non-hardening sealant is ideal for multiple applications. The non-hardening property indicates that it will not dry out while in the can. You can use it on aluminum, PVS, ABS pipe, CPVC, reinforced fiberglass, stainless steel, galvanized steel, and polyethylene among others.

And that’s not all!

You can pressurize this T Plus 2 sealant immediately after application. Moreover, this sealant can withstand pressures of up to 2,000 psi and 10,000 psi in gases and liquids respectively. Another benefit of choosing this sealant is that it protects and lubricates threads.

Also, we can’t undermine the fact that it’s free from lead and other metals.

As for the packaging, this sealant comes in a 4 fl. oz. bottle. You can easily apply it following the manufacturer’s instructions contained in the bottle. Overall, if you’re working on an area that requires immediate pressurization, look no further as this RectorSeal thread sealant is the ideal product for you!


  • Best for natural gas lines
  • Non-setting & PFTE enriched formula
  • Allows immediate pressurization
  • Low friction coefficient
  • Multi-purpose thread sealant


  • Made by RectorSeal Corporation
  • Weight: 6.7 ounces
  • Size: 4 oz. can
  • Color: white

4. OATEY Pipe Joint Compound with PTFE with Brush

Oatey is a brand name that has achieved excellent recognition among consumers.

As if that’s not enough, their products are backed with a high-quality customer and technical support programs. For that reason, you can find Oatey products in both commercial and residential applications. One of their popular product being this pipe joining compound!

Just like the thread sealant above, this pipe joint has a non-hardening formula. Thus, it offers great lubricating and sealing properties.

Is that all this sealant has to offer?

Of course not! Its formula can withstand a pressure of up to 10,000 psi and 3,000 psi in liquids and gases respectively. While its thermal capabilities range from -50° to 400° F for gases. And from -50° to 500° F for liquids.

In regards to that, it’s one of the best pipe dope for natural gas. You’ll be able to achieve a tighter assembly and seal all threaded joints permanently. It also facilitates easy disassembly without damaging or stripping the pipe threads.

This sealant is ideal for various materials. You can apply it for steel copper, polypropylene, PVC pipe, ABS, and CPVC lines. However, for plastic fittings, avoid this joint compound completely!

Apart from that, its overall quality is rather good. And it gets the job done for the recommended materials. This non-toxic sealant comes in a 4 oz. bottle! It will effectively lubricate and seal threaded joints to prevent any leakage caused by internal pressure.


  • Non-hardening formula
  • PFTE enriched joint compound
  • Wider Thermal range
  • Withstands high pressure


  • Manufacturer: Oatey
  • Weight: 6.4 ounces
  • Size: 4 oz. bottle
  • Color: white

5. Gasoila Soft-Set Pipe Thread Sealant with PTFE Paste, Non Toxic, 1/2 Pint Brush

Petroleum and propane industries prefer using sealants that are free from fillers. This is because fillers tend to contaminate gas lines. If you’re working on such a project, then this Gasoila pipe thread sealant will come in handy.

This is because it’s resistant to gasoline as well as other petroleum and alcohol products below 20% composition. It’s a soft set sealant that’s made from poly-tetra-fluoro-ethylene (PTFE).

This product is also compatible with a wide variety of materials. For instance, it’s compatible with copper, brass fittings, black pipe, tine, ABS, galvanized steel pipe, aluminum, polyethylene, and stainless steel. You can also use it on hoses. The sealant works well in temperatures ranging from 100 to 600°F.

Regarding the pressures, it works well up to 10k psi for liquids and 3k psi for gases.

Considering all these properties, you can use this product to seal up pipe threads in various lines. These include; water lines, natural gas lines, and high-pressure hydraulic lines. However, don’t use this sealant to seal up oxygen lines!

Other than that, it’s one of the best pipe thread sealant for natural gas and water lines.

This soft-set thread sealant provides a seal that’s resists becoming brittle and shrinking. That seal is also easy to disassemble after a long period of use when resealing.


  • Strong sealant
  • Locks air efficiently
  • best for water and natural gas
  • Ideal in a wide temperature range
  • Easy to apply & peel off


  • Manufacturer: Gasoila
  • Material: Non-toxic PTFE
  • Weight: 15.2 ounces
  • Size: ½ pint

6. Permatex Thread Sealant Compound for High-Performance Pipe Joints

This is yet another thread sealant from Permatex. But doesn’t come as a surprise, seeing that Permatex is one of the leading manufacturers of sealant products in the industry. The 56521 model is specifically designed with high-quality materials to give you long-lasting services!

Unlike most thread sealants, this product cures quickly to withstand pressures of up to 10,000 psi. Moreover, it helps threaded areas to resist corrosion and rust. While it’s applicable in oil senders, fuel fittings, head bolts, and coolant & oil lines.

As the name suggests, you can use this thread sealant for high performance.

And it works better than most sealant tapes and pipe dopes.

Another notable feature is that you can use this product at both low and high temperatures. Thus, it will efficiently seal the fittings where cold or hot air is flowing through. In addition to sealing air, this sealant resists leakage of a hydraulic system, diesel fuel, and oil pipes.

Moreover, since it’s certified to NSF/ ANSI standard 61, you can use it in portable water systems.

The product is available in a 50ml can that’s extremely easy to apply. Besides, the product is available in 2 different types; white and special edition. After considering various products, we rated this as one of the best high-performance sealants for sealing compressed air!


  • Easy to apply
  • High-performance sealant
  • Perfect for compressed air applications
  • Resists corrosion & rust


  • Manufacturer: Permatex
  • Weight: 1.27 ounces
  • Color: white
  • Size: 50 ml

7. Tru-Blu Pipe Dope or, Thread Sealant with 1/4 Pint Brush

So far, we have mostly looked at white thread sealants. Yet there are several other colors available as well. For that, we’ve decided to look at different-colored thread sealant that is very effective. And that is this amazing Tru-Blu thread sealant from RectorSeal!

It’s a fast-dry, versatile thread sealant that is ideal for high vibration applications like industrial and refrigeration areas. The sealant can withstand a pressure of up to 10k psi (liquids) and 2k psi (gases). Also, you can use it in areas that experience high thermal contraction or extraction.

One of the most important features of this product is that it’s enriched with PTFE! Know what PTFE does in a sealant? PTFE simply enhances thread lubrication during break out or assembly.

Another good thing is that you can apply this sealant to different materials. So, whether it’s threaded galvanized steel, copper, aluminum, brass, iron, or even reinforced fiberglass, this product will suit your needs!

This product comes packed in a 4 oz. bottle.

As for the application temperature, this sealant is easily applicable between 20 and 140° F. Therefore, you can use it for hot and cold potable water systems. Considering that, it’s one of the best water pump gasket sealers. You’ll also love how safe this sealant is! This is because it’s free from Lead as well as other metals.


  • Ideal for plastic & metal pipes
  • Fast-dry, flexible sealant
  • Vibration resistant
  • Contains PTFE


  • Manufacturer: RectorSeal
  • Weight: 6.7 ounces
  • Color: Blue
  • Size: ¼ pin

8. Loctite Pneumatic/Hydraulic Thread Sealant Bottle

For more than 60 years now, Loctite has significantly improved the reliability of its products for bonded and threaded assemblies. Therefore, there is no way one of their superb product couldn’t make it on our list.

Designed for locking and sealing high-pressure pneumatic and hydraulic systems, the Loctite sealant is a fast-curing product. You can use it for almost all air compressor fittings.

Besides, this sealant is pure and free from particles or fillers.

Unnecessary particles, fillers and contaminates are known to foul valves, clog screens, or fine filters and contaminate system fluids. So, with this pure sealant, you don’t have to be concerned about this product clogging or damaging the parts.

Apart from air compressor fittings, you can use this sealant in other applications. For instance, you can use it for brake fittings, PTO fittings, and hydraulic line fittings. Also, thanks to this sealant’s controlled strength, you can disassemble the fittings with ease!

Another plus for this sealant is that it’s easy to apply. It comes in a 1.22 fl. oz. tube with a convenient application tip. Just note that this sealant is ideal for metal fittings on pneumatic, cooling, fuel, and hydraulic systems!

Why are we stressing this? Because this product should not be applied to plastic pipes. So, if you’re looking for a plastic pipe thread sealant, look for another option.


  • Ideal for metal fittings
  • Free from contaminants
  • Withstands 10,000 psi pressure


  • Manufacturer: Loctite
  • Weight: 1.6 ounces
  • Size: 1.22 fl. oz. / 36 ml

9. Loctite Thread Sealer for Pipe Joints, 400° F Max. Temperature

Greater temperature resistance enhanced curing on passive metals like stainless steel, higher oil resistance..!

Those are some of the innovative features of this Loctite 567 formulation.

Just by looking at those features, you can tell that this product is a better option than pastes and tapes! Not to mention that it will prevent leakage of liquids and gases effectively! In addition to increasing reliability, Loctite reduces costly and unscheduled equipment failure and downtime.

This product formulation provides enhanced performance. For instance, the advanced oil-tolerant formulations ensure the sealant cures uniformly even on contaminated surfaces. Also, it’s enriched with PTFE for convenient assembly and disassembly.

Therefore, you can even disassemble the fittings with hand tools.

The sealant also promotes better performance by allowing higher temperature resistance without leaks. It can withstand high temperatures of up to 400°F with great solvent resistance.

Another great thing about this sealant is that it seals and locks tapered fittings and pipe threads. For that reason, it’s well suited for high-pressure applications. As for the application, using this product is extremely easy since it comes in a simple 6ml tube.

However, similar to the Loctite product above, this sealant is not intended for plastic pipes!


  • Contains PTFE
  • Ideal for high-pressure applications
  • Withstands up to 400°F temperature
  • Convenient assembly & disassembly


  • Manufacturer: Loctite
  • Weight: 0.48 ounces
  • Size: 6 ml tube
  • Color: white

10. LA-CO, Slic-Tite Premium Thread Sealant Paste with PTFE and with Brush in Cap

La-Co sealant paste is a non-toxic, non-drying product. You can use this sealant on various plastic and metals. So, once you buy this product, you’ll not need any other sealant. Not to forget that it provides added sealing power since its formula contains PTFE.

Besides, you can use it to seal air, natural gas, water, steam, and more.

Apart from being highly versatile, this thread sealant can withstand high pressures and temperatures. It works well in temperatures ranging from -50 to 500° F. While it can withstand maximum pressures of 3000 psi for gas and 10,000 psi for liquids.

Hence, it works perfectly even in very high-pressure systems.

Another interesting feature is how this product allows easy and quick cleanup. Hence, you can easily wash off any sealant on your clothes and hands after use. It also comes with a brush for convenient application.

Slic-Tite thread sealant has many approvals, indicating that it meets all the necessary industry standards. In general, the La-Co sealant is one of the most thread sealants in the market right now. So, if you want a multipurpose product for all your thread sealant needs, this is the ideal product for you!


  • Washes off clothes & hands easily
  • Ideal for various metals & plastics
  • -50 to 500° F temperature range
  • Non-toxic & non-drying paste


  • Manufacturer: La-Co
  • Size: 236.6 ml bottle
  • Contains PTFE
  • Color: white

11. MILLROSE – Heavy-Duty Industrial Grade Pipe Dope

Mill-Rose Monster Thread Sealant works so well that it is scary!

Once you try out this product, be ready to wave pipe dopes and thread tape goodbye! This product is specifically designed to handle metals with poor quality threads.

Some of its unique features include; soft-settling, slow-drying, and non-hardening. Therefore, it won’t separate or harden while in the can. This sealant is also non-toxic and free from lead. Not to forget that it’s made with superior materials.

Also, because of its superb ‘sticking’ properties, this sealant applies quickly and evenly to the threads. And they do this even in the presence of water and oil. So, for those struggling to find the best sealant for water pump gaskets and pipelines, this is a perfect choice!

It’s also great for assembly lines and on-site works.

When used properly, this Blue Monster sealant allows you to pressurize the system immediately after assembly. You don’t have to give it some time to cure or set!

This compound can be used to set threads on various surfaces. Whether you’re working on ABS, PVC pipe, Nylon plastic, CPVC, or metal pipe systems, this product will work for you. The product is available in 2 different formulas; one with PTFE and one without!

Moreover, you can find this sealant in various sizes.

This will enable you to choose the ideal size based on your needs.


  • Adheres to oily pipe threads
  • Easy clean-up
  • Designed for production line multi-pipe joining applications


  • Manufacturer: Mill-Rose
  • Weight: 1.8 pounds
  • Color: Blue
  • Size: 16 fl. oz.

12. PLS2 Premium Pipe Thread and Gasket Sealer Dope

Since its establishment in 1915, Gasoila has become a reputable go-to brand for professionals. They specialize in manufacturing simple, yet effective sealant products. Their products can be used in various fields like LP Gas, petroleum, HVAC, plumbing, and automotive industries.

To seal gaskets and pipe threads, try out their Gasoila PLS2 sealant!

However, with this sealant, you don’t have to limit yourself to those applications only.

Instead, you can use it for other general-purpose uses. This is because this gray product adheres well to various materials. For instance, you can use it on plastics, stainless steel, iron, aluminum, and even rubber compounds.

It also seals systems with various products like dilute acids, dilutes alkalis, gasoline, jet fuel, hydraulic oils, and steam among others.

And, this pipe and gasket sealer shouldn’t be used for oxygen.

PLS2 sealant can withstand a wide temperature range starting from -100 to 600° F. As for the pressures, it can withstand 3,000psi for gas and 10,000psi for liquid. You’ll also love how simple it is to apply this sealant. It is available in ¼ pint cans and includes a brush applicator. Besides, this product is safe to use since it’s non-toxic and lead-free!


  • Quick sticking and durable
  • Wide temperature range
  • Safe and easy to use


  • Manufacturer: Gasoila
  • Color: Gray
  • Size: ¼ pint

13. ‘Rectorseal’ – Pipe Dope or, Thread Joint Sealer

To wrap up our list is yet another thread sealant from RectorSeal!

A professional-grade thread sealant that’s widely used by gas companies and contractors for leak-proof joints. This Rectorseal No. 5 sealant can be used on a wide range of gases and fluids. As such, you can use it on LP gas, water, oils, fuels, natural gas, and more.

As for the materials, it is compatible with all kinds of metal, fiberglass reinforced, polyethylene, and PVC pipes.

This product is a softy piece thread sealant. Therefore, it seals pipe threads properly but resists hardening. In other words, this product will make the pipe easier to remove after some time.

It’s ideal to use on threaded iron, galvanized steel, stainless steel, polyethylene, copper, and aluminum. However, avoid using this sealant for oxygen and ABS pipes!

Another important thing you should note about this product is the pressure it can withstand. Unlike other sealants on this list, this product only withstands pressures of 100psi. For that, it’s only perfect for quick fixes. But if you want a reliable and long-lasting fix, consider other options. Generally, RectorSeal No. 5 sealant is the best quick-fix option out there!


  • Slow-dry, soft-set sealant
  • Ideal for quick fix applications
  • NOT for oxygen & ABS pipes
  • Multi-purpose product


  • Manufacturer: RectorSeal
  • Color: Yellow
  • Size: 8 fl. oz.
  • Weight: 9.6 ounces

Different Pipe Threads Types

When working with fittings, nozzles, or pipes, you’ll realize that their ends have different threads. If you don’t know the different thread types, choosing the right component will be difficult. In general, there are 2 main categories of pipe thread types:

  • Female/male thread
  • Parallel/ tapered thread

1. Female & Male Thread

For female threads, they’re located inside the pipe. While for the male type, threads are located outside the pipe.

Thread’s gender doesn’t necessarily affect its functionality. Instead, it’s a way of distinguishing between the 2 connections.

2. Parallel & Tapered Thread

Male and female threads can either be parallel or tapered. Tapered threads tend to become narrower as they continue outward. Contrarily, the diameter of parallel threads doesn’t change at all.

Sometimes, it’s easy to determine this characteristic through visual inspection. However, you can also use a caliper to measure the 1st, 4th, and final thread. If these threads measure the same, then it is a parallel thread type.

But, if the measurements decrease as you go outward, then that’s a tapered thread type!

Brands of Gasket and Pipe Thread Sealant or, Pipe Dope

The most popular thread sealant brands in the market today are;

1. Oatey

Having been in the business for over 70 years now, Oatey has become a reputable brand in the industry. The brand specializes in manufacturing and formulation thread sealants. And they’ve some of the best thread sealants right now.

So, how has this brand maintained to be in business for so long?

They constantly try to solve the ever-changing professional needs with new ideas, products, and technology. From high pressure and low-pressure to metals and plastic, this brand has almost all the solutions.

2. RectorSeal

Rectorseal Corporation is a chemical manufacturing company that was established in 1937. Some of their products like Rectorseal No. 5 have become a very popular option in the plumbing industry. It’s one of the most common thread sealants in the United States.

3. FedPro

Previously operating under the name Gasoila chemicals, Fedro is another reputable thread sealant brand. This company was started in 1915 and it’s based in Ohio, Cleveland. Today, this manufacture has various trusted, leading products for industrial and retail markets.

4. Mill-Rose

Established in 1919, Mill-rose is an American-based company that specializes in manufacturing twisted-wire brushes. However, they also manufacture various clean-fit products like PTFE sealants, abrasives, brushes as well as specialty tools. One of their most popular thread sealant brands is the Blue Monster product line.

5. Loctite

Headquartered in Germany, Loctite is one of the leading brands of sealants, surface treatments, and adhesives in the world. Their products are available worldwide and they’re ideal for various hobbyists and industrial applications.

Benefits of using Pipe Dope or, Thread and Gasket Sealer Compound

Currently, most professionals in the plumbing industry prefer thread sealants to other alternatives like pipe dopes and thread tapes. Why?

This is because thread sealants guarantee some benefits other methods do not! Some of these benefits include;

1. Strength

Thread sealants provide additional strength to plumbing fittings and systems. Thus ensuring your pipes are connected tightly. Once you use a good sealant, rest assured pressure from liquids and gases will not break them apart.

2. Leak-proof

The main benefit of using sealants is that they prevent leakages. With other solutions, you might experience leakage issues. As such, fluids or gases will easily pass through the joints. Luckily, with a sealant, you’ll be able to avoid that problem completely.

3. Cost

If you’re on a budget, then thread sealant might be the best option for you since they’re inexpensive. With just a few bucks, you can buy the ideal sealant to suit your needs. Besides, they’ll save you from those costly and time-consuming repair works.

4. Easy to Apply

Another benefit of using thread sealants is that they’re easy to apply. For that, you can easily apply them on any thread type in a matter of seconds!

5. Easy Disassembly

Thread sealants allow you to disassemble pipes more easily in case you want to change something. Without a sealant, pipe threads tend to rust. Thus making it hard to reconstruct the pipes after many years. Instead, they break or snap when you try to take them apart.

This might result in other major problems in your piping system. Not to mention they’ll make your repairing project more costly. Luckily, with a thread sealant, you can avoid all of these issues!


Finding the best pipe thread sealant for leaky pipes might not be that simple. However, we did our research carefully to give you the 13 best sealants or pipe dopes you can use for water, natural gas, or, PVC pipes, etc.

Even though each sealant has unique features, all of them are ideal in various circumstances.

Before you choose a product from this list, consider the pressure and temperature you’ll be using the sealant on. With that in mind, feel free to choose the sealant that matches your plumbing needs perfectly.


1. Are female pipe threads tapered?

Answer: The American NPT (National Pipe Tapered) Thread is the most commonly used connection. This pipe thread offers to bother the hydraulic and mechanical joint seal. NPT has a tapered female and male thread that seals with a jointing compound or Teflon tape. So, yes a female pipe thread can be tapered!

2. Is NPT a tapered thread?

Answer: NPT refers to National Piper Tapered Threads. That alone is enough to let you know that NPTs are tapered.

3. Are BSP threads tapered?

Answer: Indeed. British Standard Pipe Taper (BSPT) is a tapered pipe thread standard.

4. Should I use sealant with NPT thread types?

Answer: Since NPT threads are tapered, they wedge themselves together. However, to guarantee a leak-free connection, a sealant is needed.

5. Are natural gas fittings reverse thread?

Answer: Natural gas fittings are used for gases like flammable propane. One unique thing with these kinds of fittings is that they’ve got a reverse thread. This simply means that their threads are cut in the opposite direction to other fittings. Thus preventing the connection of gas lines to a water line, vent lines, or airlines.

6. How do you loosen a stuck gas fitting?

Answer: Put your wrench around the stuck gas fitting. Place the 2nd wrench around the gas pipe, near the fitting. Hold the 2nd wrench handle to secure the pipe and rotate the 1st wrench counter-clockwise. Once the fitting loosens, take off both wrenches. Now, remove the fitting by hand.

7. Is pipe thread sealant permanent?

Answer: Some of them seal the joints pretty much permanently. Such as the Anaerobic pipe thread selaer creates a strong airtight plastic seal between metal pipe threads which is really strong and long-lasting. However, longevity might depend on the treating conditions and the impacts from its surroundings.

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