ARO Compact Series 1/2" Classic Style Ported Non Metallic Diaphragm Pump, 13 GPM (49.2 LPM) flow. ARO has the world's best-selling 1/2" ported diaphragm pump! Designed to meet your OEM application needs. Efficiency - Motor design delivers optimum air efficiency. Reliability - ARO's patented 'Unbalanced' air valve ensures no-stall operation. Versatility - Center, End, Dual Inlet / Outlet, and Swivel Top manifold configurations to fit your specific application. Environmentally Sound - Bolted construction for leak-free fluid handling. Serviceability - Ease of service through modular design. Pump Casing Materials: Polypropylene, Groundable Acetal & PVDF (Kynar). Diaphragm Materials: Neoprene, Nitrile, Viton, PTFE / Santoprene, E.P.R., Polyurethane, Hytrel & Santoprene.