20018X231 Universal DROP Piston assembly Isobar 1 plug the power cord into

plug the power cord into a 110vac outlet

Includes power supply and slide cover

The large and irregular shape prevents the screening and caking of sediment in the top several inches of the filter bed as happens in the typical sand filter

This check valve can be rebuilt & reused simply by replacing the internal duck bill

Granulated Activated Carbon can be used in upflow or downflow filters

20018X231 Universal DROP Piston assembly Isobar 1 plug the power cord intoPiston 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.