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Review on MASTERCOOL 91339 R134A Ring Assortment by George Hersey

Revainrating 4 out of 5

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