Wilden Double Diaphragm Pump. Model: M8. 316 Stainless steel wetted housings, aluminum non-wetted housings, Teflon PTFE diaphragms, Teflon PTFE valve balls. Flow rate: 75 gpm. Maximum operating pressure: 125 psi. Maximum suction lift capability: 21 ft. (dry lift). Maximum solids handled: 1/4 in. dia. Inlets: (1) 3/8 in. dia. quick connect (male, air), (1) 2 in. dia. S-line fitting. Inlets: (1) 3/4 in. dia. FNPT (air filter), (1) 2 in. dia. S-line fitting. Overall dimensions: 16 in. L x 14 in. W x 26 in. H.