Pump Repair Kit Check Ball Material Santoprene Compatible with Grainger Part Number 15U531 Compatible Manufacturer Part Number S15B3P1PPAS000 Diaphragm Material Santoprene Number of Check Balls 4 Number of Diaphragms 2 Number of O-Rings 0 Number of Seals 12 Valve Type Ball Product Type Fluid End Repair Kit Media Intake Pressure (Maximum) 100 psi Compatible with Pump Type Air Operated Double Diaphragm Pump Compatible with Brand Sandpiper