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  • 6 VIDEOS
  • Refrigeration Technologies RT201B Nylog Gasket/Thread Sealant, 30 ml (1 Pack)
  • Product Overview VideoAmazon Product Imaging

Refrigeration Technologies RT201B Nylog Gasket/Thread Sealant, 30 ml (1 Pack)

4.7 out of 5 stars (10,064)
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
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  • Will not Contaminate Systems
  • Seals Flares and Threaded Connections
  • Lubricates O-Rings and Gaskets
  • Approved by OEM Manufacturers
› See more product details

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  2. Sustainability features

    This product has sustainability features recognized by trusted certifications.
    Safer chemicals
    Made with chemicals safer for human health and the environment.
    As certified by
    Global Recycled Standard

    Global Recycled Standard

    Global Recycled Standard (GRS) certified products contain recycled content that has been independently verified at each stage of the supply chain, from the source to the final product and meet social, environmental, and chemical requirements. The purchase of Global Recycled Standard (GRS) certified products supports the use of recycled content in the supply chain. A product must contain at least 50% certified GRS material to qualify for inclusion in Climate Pledge Friendly.

    Certification Body

    Intertek

    Certification Number

    TE-00326979

    Climate Pledge Friendly

    Discover more products with sustainability features.Learn more
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Product information

Technical Details

Product Dimensions ‎1 x 1 x 0.5 inches
Item Weight ‎0.8 ounces
Manufacturer ‎Refrigeration Technologies
ASIN ‎B008HOSQQQ
Item model number ‎RT201B
Is Discontinued By Manufacturer ‎No
Date First Available ‎July 5, 2012

Additional Information

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Refrigeration Technologies RT201B Nylog Gasket/Thread Sealant, 30 ml (1 Pack)

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Product Description

Refrigeration Technologies nylogâ" gasket thread sealant and assembly lube #rt201b. Product with good quality.

What's in the box

  • Bottle

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    Customer reviews

    4.7 out of 5 stars
    10,064 global ratings

    Customers say

    Customers find the gasket sealant effective, particularly for AC connections and difficult o-ring leak applications. The product receives positive feedback for its quality and ability to make connections leak-proof, with one customer noting its success with R410A flares. They appreciate its ease of use, especially for DIY mini split vacuum installation, and consider it worth the price. While the product is super sticky and adheres well to threads, some customers mention it can be messy to handle.
    AI Generated from the text of customer reviews

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    323 customers mention effectiveness, 309 positive, 14 negative
    Customers find the sealant effective, particularly for air conditioner connections and flared fittings, with one customer noting its success with difficult o-ring leak applications.
    Love this stuff. It works great . Seals instantly and stays flexible no worries of cracking or movement braking the seal . Top shelfRead more
    ...Worked great. I POSITIVE pressure tested first using nitrogen to 300PSIG, using a buddy’s N2 bottle and gauge set....Read more
    Helps prevent leaks on AC flange fittings. Works well, less expensive than others I've used, but seems to be same or very similar product....Read more
    Packaged well. Worked well. Shipped quickly. Also good to put on the flaring cone to help protect surfaces.Read more
    228 customers mention quality, 223 positive, 5 negative
    Customers find the gasket sealant to be of excellent quality, noting that it never disappoints and works well as a sealer.
    This is a great product. Use only to lubricate and seal the sealing surfaces of the flare connection and the back of the flare sparingly....Read more
    Good product, easy to use for DIY mini split vacuum installation.Read more
    Good stuff. Maybe not necessary but assured a great leak free seal on all refrigerant line flared connections.Read more
    Great stuff. Had to order it because in los angeles you cannot buy it in a store unless you have an hvac license....Read more
    213 customers mention leak-proof, 184 positive, 29 negative
    Customers find the sealant effective at stopping leaks, with one customer specifically mentioning its success with R410A flares.
    ...When applied line set Torquing is smooth and accurate. No leaks, no line twist while tightening. Now a permanent addition to my tool bag.Read more
    Used for mini split install and had no leaks and everything has been working greatRead more
    ...Also provides a sense of extra safety/protection against leaks, great ease of mind.Read more
    This stuff is great! Solved a chronic leak issue on my 2000 Ford Taurus that I have been fighting for two years!Read more
    102 customers mention compatibility, 96 positive, 6 negative
    Customers find the gasket sealant compatible with HVAC applications, particularly for flared connections, with multiple customers noting its effectiveness in sealing these connections well.
    A must have for flare fittings.Read more
    A must if you are connecting refrigerant lines. Compatible with refrigerant so any little amount in the line will not contaminate the refrigerant.Read more
    This stuff works great for. Flair fittings on 410A mini spilt systems use the blue bottle for 410a and red bottle for R22Read more
    A must for AC installation!Read more
    80 customers mention ease of use, 74 positive, 6 negative
    Customers find the gasket sealant easy to use, particularly for DIY mini-split installations, with one customer noting it works well with flare nuts.
    ...Easy to use with good design on the application tip. First try and no leaks anywhere, holding vacuum strong during the leak test....Read more
    ...The sealant is easy to apply, stays in place, and performs well even in systems exposed to vibration and temperature changes....Read more
    Product viscosity is ideal for assembling threaded joints and very easy to use.Read more
    ...No torn O-rings and easy attachment. Vacuum check showed no leaks....Read more
    56 customers mention value for money, 48 positive, 8 negative
    Customers find the gasket sealant to be worth the price, with one customer noting it's good insurance for under $10.
    ...Product doesn't get hard at all and it's a great price. Color is clear on the product.Read more
    Fast shipping and good priceRead more
    Great Purchase, worked greatRead more
    good valueRead more
    49 customers mention sealing, 44 positive, 5 negative
    Customers find the sealant effective, noting it hardens solid and prevents tearing of o-rings, with one customer mentioning it successfully sealed their mini split lines.
    Few drops on your mini split lines and no leaks to be had. I use it on automotive ac systems also.Read more
    Easy to use. Hardens solid. No leaks so far. (next day).Read more
    Seams good, only time will tell. It's clear, some color would make it easier to see for applicationRead more
    ...May also permanently fill micro-gaps in the metal surfaces since feels a bit gummy, at least to contain current refrigerants and oil.Read more
    59 customers mention stickiness, 35 positive, 24 negative
    Customers have mixed experiences with the gasket sealant's stickiness, with some finding it super sticky and effective, while others report that it stays exactly where applied.
    Very sticky stuff. I applied it to all the connections on my mini-split.Read more
    ...use more than half the small bottle I think, because it’s so thick and sticky it’ll be hard to get it all out. Basically twice as expensive....Read more
    ...The sealant is easy to apply, stays in place, and performs well even in systems exposed to vibration and temperature changes....Read more
    ...This bottle will last a while. Super sticky if ya get on handsRead more
    Good investment
    5 out of 5 stars
    Good investment
    I installed a mini split and used this on the copper fittings. I cut and replaced the lines (5/8 and 1/4). No leaks.
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    Top reviews from the United States

    • Andrew
      5 out of 5 stars
      Excellent Outdoor Light with Convenient GFCI Outlet
      Reviewed in the United States on June 8, 2026
      Brief content visible, double tap to read full content.
      Full content visible, double tap to read brief content.

      The Refrigeration Technologies RT201B Nylog Gasket/Thread Sealant is an excellent product for HVAC and refrigeration work. I've used it on flare fittings, threaded connections, O-rings, and gaskets, and it consistently helps create leak-free seals. Unlike traditional thread sealants, Nylog remains flexible and does not harden, making future maintenance and disassembly much easier.

      What stands out most is its compatibility with refrigerants and compressor oils. It lubricates connections during assembly while providing an extra layer of protection against leaks. A small amount goes a long way, so the 30 ml bottle lasts much longer than expected.

      The sealant is easy to apply, stays in place, and performs well even in systems exposed to vibration and temperature changes. It's a trusted product among HVAC professionals for good reason.

      Overall, if you're working on refrigeration or air conditioning systems and want a dependable sealant that won't contaminate the system, the RT201B Nylog Blue is a worthwhile addition to your toolbox. Highly recommended.

      3 people found this helpful
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    • Z. Nemeth
      5 out of 5 stars
      Very helpful in amateur HVAC work.
      Reviewed in the United States on June 8, 2026
      Brief content visible, double tap to read full content.
      Full content visible, double tap to read brief content.

      The Nylog arrived promptly. Used it in the installation of a mini-split. The product is easy to use. The mini-split has been working beautifully with no refrigerant leaks during testing and operation for about three days so far.

      3 people found this helpful
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    • wesley
      5 out of 5 stars
      Insurance for DIYer
      Reviewed in the United States on June 12, 2026
      Brief content visible, double tap to read full content.
      Full content visible, double tap to read brief content.

      used to install Minisplit, works well, good reassurance for long lasting seals. Used as recommended on head of cones where the flare joins, putting several mini-splits on an older home retrofit. Easy to use, ample supply for multiple applications. Seems wise to prevent possible leakage for the price compared to replacing lost refrigerant on a DIYer.

      One person found this helpful
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    • DanEnzmann
      4 out of 5 stars
      Frequently mentioned on installation videos.
      Reviewed in the United States on April 13, 2026
      Brief content visible, double tap to read full content.
      Full content visible, double tap to read brief content.

      Seals compression fittings on pipes. Expensive, and worth it. Replacing lost refrigerant cost much more.

      2 people found this helpful
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    • MNsotahome
      5 out of 5 stars
      Good stuff!
      Reviewed in the United States on May 5, 2026
      Brief content visible, double tap to read full content.
      Full content visible, double tap to read brief content.

      Good quality stuff, well worth having it, i don't know how effective it is, because i never had a leak that i put it on that then fixed it or something like that, but i haven't had a leak on connections i have used it on, so thats something! Overall easy to use, and definitely worth going the belt and suspenders route when most refrigerants are so expensive now.

      One person found this helpful
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    • EMMETT DIXSON
      5 out of 5 stars
      Works great! Recommended
      Reviewed in the United States on June 20, 2026
      Brief content visible, double tap to read full content.
      Full content visible, double tap to read brief content.

      Nylog Rocks - make all your connections leak proof with Nylog!

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    • matthew c stone
      5 out of 5 stars
      Ok
      Reviewed in the United States on June 19, 2026
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      Full content visible, double tap to read brief content.

      I'm sure it's a good product. Didn't use it though. Returned

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    • John K.
      5 out of 5 stars
      Sticky as molasses
      Reviewed in the United States on April 17, 2026
      Brief content visible, double tap to read full content.
      Full content visible, double tap to read brief content.

      This stuff is sticky so wear gloves when applying. Works very well to take up small gaps around o-ring seats to seal high pressure A/C systems. If you're using UV leak detector, this goop glows bright blue, where the UV detector glow bright yellow/green. There is no accidentally mistaking one for the other.

      5 people found this helpful
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    See more reviews

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    Product Summary: Refrigeration Technologies RT201B Nylog Gasket/Thread Sealant, 30 ml (1 Pack)

    From Refrigeration Technologies

    4.7 out of 5 stars, 10,064 ratings

    Customer reviews

    1K+ bought in past week

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    About this Item

    • Will not Contaminate Systems
    • Seals Flares and Threaded Connections
    • Lubricates O-Rings and Gaskets
    • Approved by OEM Manufacturers

    Product Description

    Refrigeration Technologies nylogâ" gasket thread sealant and assembly lube #rt201b. Product with good quality.
    Report an issue with this product or seller

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