RED TEK ProSeal22 A/C Seal Treatment (4 oz. can)

Product worked as advertised. My air condition still working after 4 years. Highly recommended

Put 2 in a 4 ton unit with a pin hole leak on the a-coil. So dang small it takes a year to loose refrigerant. It worked perfectly and very easy to use.

Leak was small enough to require a recharge once/year. After using this product, leak stopped over a 2 month period and held over winter and spring idle period. No sign of leak over month of summer use..

Long term update. I have a very small leak. Will hold -30 vacuum for days, and only then after a week vacuum reading is -28 or so.. And must be fair here, system is 28 years old. I have use this product twice over the last three year holding a enough refirgerent to cool the home all summer. But both each times system is empty after winter. I would not recommend this product for a long term fix with a small leak . That and the high cost of refrigerant these days. I'm in the process of renewing my complete home A/C system.

Great stuff, I had a very slow leak in my hvac and this fixed it. Had to put some coolant in after installing this but it is still working great after 2 years.

I have a 3 ton A/C unit I bought used with a full charge. Installed it to my house and most freon leaked out in 3 days. I added the 4 oz. can of RED TEK ProSeal22 to my unit and the topped off the freon again. In 3 days the freon was low, so I added more freon and now 4 weeks later no more leaks.

Didn’t seal anything. Had a very small leak in my line was told to try this and fill the Freon back up. Did not last more than a month and now I have to fork over the money for better repairs!!!

I'm sure it works wonders but my piercing valve didn't work on the seal for some reason. The thread on the can is press type and not cut thread and annoying so use caution when turning a fitting on the threads.