Pump Repair Kit, Check Ball Material PTFE, Compatible with Grainger Part Number 12W421, Compatible with Manufacturer Model Number S1FB3P2PPNI000, 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