Repair numerous essential diaphragm pumps with the help of this handy kit. Six valve assemblies are included (part 9910-1889050) along with six O-rings (part 9910-1140450). Many different hydro pump operations depend on having valves, O-rings, and other components in perfect working order; handy replacement parts allow users to prevent costly breakdowns and delays with instant repairs. Have kits on hand for common maintenance tasks.