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.

Does what it's supposed to do, goes on easy, quite sticky so it stays in place.

Fantastic product,no leaks, i just know that every company has priced gouged the nation since walmart surpassed the federal minimum wage and every business has followed the same selfish path.

seems to work time will tell

Connected lines using this sealant without any leaks. easy to apply and works well

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.

I mainly use it on flare fittings when I’m swapping out or tweaking the mini-split and the kitchen fridge. The cool part is how tacky it is. It stays where you put it instead of dripping everywhere, so i can take my time tightening stuff without making a mess. One night I was half awake, sealing a stubborn connection behind the fridge, and this made it way less annoying. Tiny tube, but it goes a long way.