JB Industries NFT5-4 O-Ring Seal Cap, 1/4" All pipe connections have internal braze cups for dip tube applications 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