Every 6 months to a year, the diaphragms, check valves and wear parts in your Udor KAPPA-55 pump need replacing. To ensure you're getting the most GPMs out of your pump, install new diaphragms with the complete diaphragm repair kit. Each kit includes 3 replacement piston diaphragms, an accumulator diaphragm, diaphragm bolts, diaphragm washers and o-rings. Increase the longevity and performance capabilities of your industrial pump, and improve the efficiency of your spraying.