Compatible with all CSI Signature 1 and 2 filters except for CSI Nitro, Nitro Pro and Sidekick, and all  Watersoft Isobar 2 filters except for the  Centuri and Sidewindr

Includes:

• Seal and spacer kit
• Piston assembly
• Replacement o-rings for tank, dist. tube, drainline flow control, and adapter couplings