Diaphragm Pump Repair Kit Check Ball Material Santoprene Compatible with Grainger Part Number 3CCW4 Compatible with Manufacturer Part Number HDB1 1/2 SS8A Diaphragm Material Santoprene Number of Check Balls 4 Number of Diaphragms 2 Number of O-Rings 4 Number of Seals 0 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