Review on MASTERCOOL 91339 R134A Ring Assortment by Dave Russell
Worth Every Penny - Air Conditioning Tools & Equipment
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.
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