Complete Pressure Vessel Repair Kit, 1/2" and 3/4" 375ST used with RK34-375VST. Kit Contains O-Ring, #1 Check Seat, #1 Check Seat, Poppet Screw (x2), Check Seal Retainer (x2), Check Seal Ring (x2), Poppet (x2), #1 Check Spring, #1 Check Spring Retainer, O-Ring, #2 Check Seat, #2 Check Seat, #2 Check Spring, #2 Check Spring Retainer, O-Ring, Housing Inlet, Test Cock, SS (x3), Check Housing, O-Ring, Housing Outlet, O-Ring, Relief Valve Cover, O-Ring, Relief Valve Seat, Relief Valve Seat, Relief Valve Spring, Relief Valve Seal Retaining Screw, Relief Valve Seal Ring, Relief Valve Lower Plunger, Diaphragm, Relief Valve Upper Plunger, O-Ring, Relief Valve Stem, Relief Valve Cover, Relief Valve Cover Screw, Short (x2), Relief Valve Cover Screw, Long (x4), and Test Cock Cap Plug (x3).