ARO 637309-AA Pump Repair Kit. Diaphragm Pump Repair Kit, Check Ball Material Santoprene, Diaphragm Material Santoprene, Number of Check Balls 4, Number of Diaphragms 2, Number of O-Rings 6, Number of Seals 10, Valve Type Ball, Product Type Fluid End Repair Kit, Media Intake Pressure (Maximum) 120 psi, Compatible with Pump Type Air Operated Double Diaphragm Pump, Includes Balls, Diaphragms, Seals, Media Temperature (Minimum) -40 Degrees F, Compatible Connection Media Type Fluid, Compatible with Series EXP. Light Industrial Equipment & Tools. This listing is currently undergoing maintenance, we apologise for any inconvenience caused.