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.