(2) Wilden Air-Driven Double Diaphragm Stainless Steel Pump. Model: M8. Flow rate for new pump is 120 gpm with required air consumption and pressure at 30 psi. Discuss with salesperson your process and product to determine if this refurbished pump should handle your specific duty. 316 stainless steel construction. Ball check valves and Teflon diaphragms. Max pressure: 125 psi. Maximum solid size: ¼ in. Self-priming pump which is ideal for handling abrasive and viscous materials. This pump is not food grade rated. Overall dimensions: 1 ft. 6 in. L x 1 ft. W x 1 ft. 3 in. H.(ACN48).