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