Wet End Repair Kit, Check Ball Material PTFE, Compatible with Grainger Part Number 12W427, Compatible Pump Manufacturer Part Number S1FB1A2TANS000, Diaphragm Material PTFE, Number of Check Balls 4, Number of Diaphragms 2, Number of O-Rings 0, Number of Seals 0, 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