MASTERCOOL 91339 R134A Ring Assortment Review

Perfect! Every time I needed an AC O-ring I had to search through the entire range to find the right one. This kit has all the sizes I need in one package.

This set had a nice range of sizes with enough left over for future projects. It fits all dash panels on my 1994 Honda Del Sol.

Mastercool (91339) R12 and R134a o-ring set arrived quickly with no damage. This is a wide range of O-rings that can be used with R12 or R134A. They appear to be well made.

When you consider how bad it can be when an O-ring fails and how hard it is to find one at this point, having a set like this on hand is priceless. The o-rings in this kit are nice to the touch and they have all held up great since installation. Having lots of extras is a great peace of mind.

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…

O-ring kit contains different sizes of O-rings. The picture shows the dimensions printed on the storage case, the kit I received is not labeled as in the picture below. If you are looking for a quality kit then look no further. I recently used the o-rings from this kit to repair a leaking air conditioning system where the system had only recently been serviced by a local air conditioning technician. I determined that the newly installed o-rings were the cause of the leak, when I removed and…