Rebuild kit for Fleck 2510 Softener valve. Kit includes piston assembly, seal & spacer kit, and brine valve. These components often ware overtime and will cause water to continuously flow to drain. It is best to replace all at the same time to avoid water waste and to help save on costs. Comes with the following items Fleck - 60090 Piston Assembly Fleck - 60121 Seal & Spacer Kit Fleck - 60011 Brine Valve assembly