Relief Valve Complete Internals Repair Kit, 8" and 10" used with RK8-375RVCI. Kit Contains O-Ring, Upper Plunger, Upper Plunger, Diaphragm, Lower Plunger, Seal Ring, Seal Retainer, Washer, Bolt, Relief Valve Spring, Relief Valve Seat, O-Ring, Relief Valve Seat, and O-Ring, Relief Valve.