DLX pH-Rx/MBB Version 0507: PP (Polypropylene) Pump Head PTFE (Teflon®) Diaphragm FPM (Viton®) Seals Duck Bill FPM (Viton®) Valves Flow Rate - 1.32 GPH GPH (5 LPH) at 101 PSI (7 BAR); 1.59 GPH (6 LPH) at 72 PSI (5 BAR); 2.11 GPH (8 LPH) at 29 PSI (2 BAR) 120 Strokes per Minute