ARO PRO Series 2" Ported Non Metallic Diaphragm Pump, 145 GPM (548.8 LPM) flow. Robust construction with thick walled injection, molded fluid casings and cast iron or aluminum center sections to withstand tough industrial applications. Efficiency - Motor design delivers optimum air efficiency. Reliability - ARO's patented 'Unbalanced' air valve ensures no-stall operation. Versatility - Multiple porting options for your application needs - Available in. Flanged, Threaded, or 3 piece Manifold configurations. Environmentally Sound - Bolted construction for leak-free fluid handling. Serviceability - Easy access to ball checks and fluid caps for maintenance and repairs. Pump Casing Materials: Polypropylene & PVDF (Kynar). Diaphragm Materials: Viton, PTFE w/ Santoprene backer, Hytrel, Santoprene, Nitrile, Neoprene & E.P.R.