Leak Saver Direct Inject UV - Refrigerant Leak Sealer with Added UV Dye to Detect Large Leaks - for AC, Refrigeration, and Automotive Systems Up to 5 Tons - Compatible with All Refrigerants - 3 Packs

There's not much more I can say about a product that truly works. I replaced my outdoor compressor with R407C, a direct replacement for old R22 system. The coil was in the attic and almost impossible to reach comfortably. It is 25 + years old. This year, I was losing pressure, so I gave this a try. BOOM ! leak stopped immediately. I added more gas and at 90 degrees out, I'm pushing 68 indoors. Contrary to HVAC guys, this product works and at $37 a squirt, any other conversation is used car talk ! And so simple to do, I bought 2 more for other systems I have. TRY THIS FIRST, SAVE THE BS

This is the second batch of Refrigerant Leak Sealers that I've used. I was losing a lot of freon from 2 systems. The initial treatments stopped the leaks almost completely. After a couple of years, one system started to leak a little. Another treatment stopped that as well. Now it's several years later and another treatment has boths systems working great and leak-free. The HVAC company charges $100-$150 per treatment for a very similar product. My builder-grade AC systems are almost 20 years old. Ours is the only home in our development that hasn't had to replace the AC systems. You do need a a basic manifold gauge set or injection kit, but it's simple to use.

As an HVAC novice but a buildings expert I can Highly recommend this product for its ease of installation and effectiveness. It worked as advertised sealing a small leak in my lineset. Was quoted $8k from a reputable repair company I was able to fix the leak and recharge myself. Ill note the device has a low loss fitting attached making it not only effective but safe to use for even a novice like me. You dont want to get frostbite from the refrigerant. Also the included diagram makes it fool proof.

I put this leak stop in yesterday. Will see how it impacts run times. Installation was super easy and they give you nice quality fittings for the injection. My only remaining concern is how well it works. Product was packaged well, with clear instructions. No complaints so far - we'll see what the results are.

Worked well. I had a leak in my 12 year old mini split system and this extended the time between charges from about 4 months to about 2 years. I finally replaced the system, but this product saved me hundreds in the meantime.

Just like every kind of stop leak product I've tried in the past, it simple did not work. It has slowed the leak down, the AC has poor cooling after a month instead of almost no cooling after a month.

I'd been trying to locate a small Freon leak with soap sprays, oil residue searches, & Freon sniffers on the 7-year old split unit heat pump in my shop. It would run for 4 to 5 months of cooling & heating, then suddenly shut down with low pressure indicated. It tended to run longer cooling than when heating. I was leary of stop-leak products in general because of bad experiences in car systems; the stuff plugged up everything (like thermostats) as well as the intended target. The R-410A systems run at very high pressures compared to old R-22 systems so I expected to find a fitting not quite tight enough to hold the refrigerant. No luck. I viewed the clear tubing holding the stop leak & UV dye with suspicion--didn't look strong enough to hold the high pressure. The connectors fit perfectly (I already had the adapter on the low-pressure line needed to connect the low-pressure hose); they were just like an extension of the charging hose. I decided to do the injection & recharge in one go. I set up liquid injection into the low-pressure line to make sure the contents were diluted promptly. When I opened the tank charging valve the yellow fluid in the clear tubing vanished immediately followed by boiling R-410A. I watched while the scales moved smoothly up to the 68.8 oz charging spec with the system running on cooling. Everything worked fine for about an hour then the system shut down. Turned out there was more residual R-410A than I expected & the system stopped (high pressure cutoff) when the fluid temperature came up to the 100 deg F outside temperature. I decided to let the system pressure equalize--give the leak a chance to expel some of the stop leak fluid. Air & moisture was suppose to cause it to harden & plug the leak. Sure enough, the next day the AC came on & the air coming out of the evaporator was a chilly 50 deg F. It has worked great both as a heat pump & AC since then. I haven't tried to located my UV light to see if any dye escaped. I expect that will be easier to find if significant R-410A escapes in a few months. Follow the instructions; I recommend this for small leaks--don't waste R-410A (or any other refrigerants) trying to plug large leaks. The dye-only version is probably your best approach in that case.

I was expecting it to be 100% liquid, but there is a little gas in the tube. We'll see how it holds up. Sure is simple to use though. I will update in the future. Update: Turns out the gas in tube is a fill gas that is harmless. Bad news is that refrigerant continued to leak and the leak wasn't ever found with a UV light.

Had a leak last year. Used this after refilling to try to last for another summer and so far it held up a year later! I have stopped using the heating cycle to prevent useless thermal stress and extend it as far as possible. I tried to cheap out buying this and a manual pump and adapters and whatnot. TLDR: Don't cheap out and get the Co2 injector too.

It does not work

Don't buy this product! They all came broken and of course you can't return these.

it didn't worked, I used this product in my Skoda Superb, 1.8 TSI car AC , in which the AC gas leaks in 22 to 24 days , but after using this product nothing changed. now also the gas leaked in 22 days

Worked as sold. Easy to install