20001X231 Piston Assembly
Replacement piston and end plug assembly
Compatible with:
- CSI Signature 1, 2, and 3 softeners and filters*
- Watersoft Isobar 2 & 3 softener and filters**
- Clearion 300 Series Softener and filters***
*Except for Sidekick or Nitro Filters manufactured after 6/1/2015, which use 20009X231
**Except for Sidewindr or Centuri Filters manufactured after 6/1/2015, which use 20009X231
***Except for Sidekick or 360 Filters manufactured after 6/1/2015, which use 20009X231
Anytime you're replacing a piston, we recommend also installing a new seal & spacer kit.