Assembly Kit, Check Ball Material Neoprene, Compatible with Manufacturer Model Number 666053-311, 66605J-311, Diaphragm Material Neoprene, Number of Check Balls 4, Number of Diaphragms 2, Number of O-Rings 11, Number of Seals 11, Valve Type Ball, Product Type Fluid End Repair Kit, Media Intake Pressure (Maximum) 120 psi, Compatible with Pump Type Air Operated Double Diaphragm Pump, Compatible with Brand Ingersoll Rand / ARO, Includes All Fluid Section Replacement Parts Except the Ball Seat