JB Industries QC-S5 5/16" Quick Coupler x 1/4" SAE All valves are equipped with cap and one valve core (braze type, loosely assembled) Temperature range -40 degrees to +250 degrees Fahrenheit (-40 to 121.1 degrees Celsius) Valve core is stainless steel and brass for use with all refrigerants including R-410A Resistant to oils, alkylates and diluted mineral acids