Review on MASTERCOOL 91339 R134A Ring Assortment by William Stevenson

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 examined the o-rings they were the same size in diameter but much thinner than the o-rings in this kit. I'm not sure if nylog would help. So far the kit had all the dimensions needed for a pressure switch, replaced the o-rings on the high and low pressure lines, no compressor o-rings, which is to be expected, although this kit does have a compressor o-ring. -Rings suitable for the early Mazda B2500. When purchasing a new compressor, o-rings will be supplied with the unit and some new replacement receiver dryers will come with replacement o-rings for the compressor, again depending on the manufacturer. lost the o-ring. I bet you've never done anything like this before. In a short time you'll find out which o-rings are used the most and only stock those - so many sizes in the kits you'll never use.