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

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.

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.

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.

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

Nice little squeeze bottle, like the white glue uses. Easily poors onto the threads of un-gasketed refrigerant lines. Let dry over night and drew down a vacuum and the vacuum held for another 4 hrs with no signs of leaks. Refilled the refrigerant and away we go. NICE cold A/C. A small bottle will last a Automotive Pro a few months, a Shade tree R-134a user will have 1000 X more than they would need. For 1 time use little 2g tubes would be fine for home. But for the Pro. EXCELLENT value for the THE BUCK. Highly recommend.

Thick stuff, works great

Works as advertised. Gave me confidence that the ac Connections were sealed properly.

Fantastic Stuff! I installed a new mini split AC unit and had a vacuum leak. I bought this stuff, put it on the flare fittings, and after torquing it to spec....BAM! No more leak. This stuff is amazing!