O-Ring for 1st Generation POE Systems with 4.5" diameter filters.

This P-151122 O-Ring fits 1st generation ICS Whole House POE systems with bottom drain sold from March 2011 to May 2019.

This O-Ring is BLACK COLORED and will not fit 2nd generation treatment systems with a BLUE COLORED O-Ring.

To purchase the second generation blue colored O-ring you need PN: AF-ORING45   

Replacement filter housing O-Ring for 1st Generation Water Treatment Systems including;