Replacement O-Ring Seal for home RO membrane housing PV2012PME for 1.8" to 2" Diameter x 12"L Membranes.  The O-ring seats between the body and cap of the housing, forming a tight seal when the cap is twisted onto the body.  O-Rings should be inspected for wear, twisting, tearing, or cracking each time the membrane elements are replaced, and replaced when there are signs of wear.  Damaged o-rings can cause the housing to leak.

EPDM O-Rings are are recommended to be lubricated with DOW Corning 111 High Grade Silicone Lubricant.