5600 Softener Piston Assembly 60102-00.
Used on all Fleck 5600 softener valves since 1979.

Also, used on some Fleck 5600 Filter Valve applications instead of the longer backwash Filter Piston version ( 60102-10 ) with the black end cap.

And there is a "Low Water" version ( 60102-20 ) with the gray end cap ( used mostly on city water in California ) and not recommended on well water.

• How To Rebuild Directions
  

5600 Piston Assembly Types - Softener - Filter - Low Water, Piston Assembly 60102-00, 60102-10, 60102-20,
What is the Difference?