Get current pricing for Pulsafeeder, 37 GPH Pulsafeeder Hydraulic Diaphragm Metering Pump Model 25hj. It Has A Gear Ratio Of 15, Piston Dia. Of 50mm, Max. Flow Of 37 Gph And A Max. Pressure Of 1 . Product Category: Process Equipment, Sub Category: Water Treatment - Misc.: