Fluid End Repair Kit, Check Ball Material Santoprene, Compatible Grainger Part Number 15U527, Compatible Manufacturer Model Number S20B1A1EANS000, 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, Standards Not Applicable. This item has been restricted from sale in the following state (s): []