20018X231 Universal DROP Piston assembly Isobar 1 The Final Rinse Piston is

The Final Rinse Piston is only compatible with the following units:

**warning: not for use with units that contain KDF media or KDF foam cubes

All parts can also be purchased individually by selecting that item number in the drop-down menu

WaterSoft Isobar 4

DROP FC-40

20018X231 Universal DROP Piston assembly Isobar 1 The Final Rinse Piston isPiston assembly used on all residential DROP control valves. This piston will have a blue mark on the top of the yoke. Also compatible with: CSI Signature 4 WaterSoft Isobar 4 Clearion 400 Series Anytime you're replacing a piston, we recommend installing a new seal & spacer kit.