Diaphragm Pump Repair Kit Check Ball Material Santoprene Compatible Grainger Part Number 6WY91 Compatible Manufacturer Part Number DS4CI HDB2 Diaphragm Material Santoprene Number of Check Balls 4 Number of Diaphragms 2 Number of O-Rings 4 Number of Seals 2 Valve Type Ball Product Type Fluid End Repair Kit Media Intake Pressure (Maximum) 125 psi Compatible with Pump Type Air Operated Double Diaphragm Pump Includes (2) Diaphragms (4) Check Valves O-Rings Seals