Pump Repair Kit, Check Ball Material Santoprene, Compatible with Grainger Part Number 3FPY6, Compatible Manufacturer Part Number 66M250-1EB-C, Diaphragm Material Santoprene, Number of Check Balls 4, Number of Diaphragms 2, Number of O-Rings 5, Number of Seals 5, Valve Type Ball, Product Type Fluid End Repair Kit, Media Intake Pressure (Maximum) 120 psi, Compatible with Pump Type Air Operated Double Diaphragm Pump, Includes Diaphragms and Related Seals, Includes Balls