Along with clamped configuration, PS20 Original™ Metal AODD (air-operated double-diaphragm) Pump features Pro-Flo® SHIFT Air Distribution System (ADS) that eliminates over-filling of air chamber and reduces energy consumption. Wetted path is cast iron, and center block material options include aluminum, polypropylene, and stainless steel. Pump offers max discharge pressures to 125 psig, max flow rates to 277 gpm, and max suction lifts to 14.4 ft (dry) and 28.4 ft (wet).