Wet End Repair Kit Check Ball Material Santoprene Compatible with Grainger Part Number 12W425 Compatible with Manufacturer Model Number S1FB1A1WANS000 Diaphragm Material Santoprene Number of Check Balls 4 Number of Diaphragms 2 Number of O-Rings 0 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 Compatible with Brand Sandpiper