The innermost is the temperature: corresponding to R134A R12 R22 air conditioning systems. 1 CT-337 Freon Opening Valve. Versatile Use: This refrigerant pressure gauge set is not limited to just one type of vehicle; it's a versatile tool that can be used on any DC12V-24V automotive air conditioning system, including cars, motorcycles, buggies, SUVs, and boats.
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