RMW 3400rpm, D Version 7/8-Inch, Vertical Gas Engine Flange, Manifold: Aluminum precision die cast special anticorrosion finish, Bolts: Three 6mm cadmium plated steel, Plungers: hardened stainless steel, Crankcase: Orecision die cast, large coupling fins, Bearings: Premium oversized ball and needle bearings, Valves, Seats and Springs: Plastic poppet under 2300 psi, stainless steel poppet over 2300 psi, seat and cage, stainless steel spring, Seals: buna-N 2000 and 2400 psi single seal, 2500 psi to 3000 psi dual seals, SX suffix port rotated 180 degrees from standard, SKU: NRTHAM003