Henry 7774 Packed Shut-off Valve, 3/8" FPT x 3/8" FPTPacked valves are so called as the stem is sealed via a packed gland.ApplicationsHenry Technologies packed valves are used in a variety of air conditioning and refrigeration applications for isolating, flow control, charging and purging purposes.All valves are suitable for HCFC and HFC refrigerants, along with their associated oils.Materials of ConstructionThe valve body is made from steel. The stem is made from plated steel. A metal-to-metal seat seal is used. A graphite compound is used for the packing gland. The seal cap is made from molded plastic or steel.