Rittenhouse Hypro D252 BlueFlex 9910-KIT1723 Diaphragm Repair Kit (9910-KIT1723BLUE)

Using in a truck mounted sprayer. I averaged changing the regular black diaphragm about every 3 months. With the blue diaphragms, I've run it for 6 months and the hydraulic fluid is still clear, not milky when water from the pump enters the housing. Well worth the few extra dollars!