Review on MASTERCOOL 91339 R134A Ring Assortment by Aaron Cruz

Good choice for the price but if you are planning to rebuild a car air conditioner (R12 or R134a) you definitely cannot replace all your o rings with this kit . I recently replaced all of the o-rings in my '94 Chevrolet and 2009 Kia Rio trucks that I purchased vehicle specific o-ring kits for, and just for comparison I have this kit in the correct o-ring location during repairs Size checked and any O-rings not included in this kit can be used. The problem is that many o-rings had the correct inside diameter, but were too thin to use, so the outside diameter wasn't correct. If you are planning to use this kit to replace o-rings in your car, don't waste your money. I recommend buying a car specific o-ring kit. I bought mine for about $5 a car from a well known wholesale auto parts site which I won't name but it starts with an R.