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Review on MASTERCOOL 91339 R134A Ring Assortment by George Hersey
The Mastercool (91339) R12 and R134a o-ring assortment works as advertised.
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.
Pros
- Consistent test results
Cons
- Not as thick as others
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