20922C203 Piston Assy. - Isobar 1 Filter - Orange Cap (Old Style)
Replacement piston assembly for WaterSoft Isobar 1 filters manufactured prior to 2010 (blue valve body). If your filter has an orange cap like this one, then you need to use this piston.
If your piston has a White Cap, you need the 20561X254
If your piston has a Black Cap, you need the 20562X254
Note: We recommend installing a new seal & spacer kit anytime a piston is being replaced.