Diaphragm Pump Repair Kit, Check Ball Material Neoprene, Compatible with Grainger Part Number 5U680, Compatible with Manufacturer Model Number 6661T3-311-C, 6661U3-311-C, 6662A3-311-C, 6662B3-311-C, Diaphragm Material Neoprene, Number of Check Balls 4, Number of Diaphragms 2, Number of O-Rings 21, Number of Seals 21, Valve Type Ball, Product Type Fluid End Repair Kit, Media Intake Pressure (Maximum) 120 psi, Compatible with Pump Type Air Operated Double Diaphragm Pump