20001X231 Piston Assembly
Replacement piston and end plug assembly
- CSI Signature 1 and 2 softeners and filters*
- Watersoft Isobar 2 softener and filters**
*Except for CSI Nitro Filters manufactured after 6/1/2015, which use 20009X231
**Except for WaterSoft Centuri Filters manufactured after 6/1/2015, which use 20009X231
Anytime you're replacing a piston, we recommend also installing a new seal & spacer kit.