Product Review

Water Filter Housing Replacement O Ring For 3M Purification Aqua-Pure AP801 / AP802. We recommend consumers keep a spare o ring on hand to avoid urgent situations. This o ring will accomodate filter housings which require large diameter cartridges. These cartridges have an approximate diameter of 4.5 inches. The o ring itself actually measures approximately 5 5/8 inch (inside diameter). An o ring facilitates a water tight seal between the water filter sump and the water filter head. The most common o rings (o-rings) used in water filtration are made from Buna N material. Buna N is also commonly referred to as nitrile. This is the ideal choice for cold water filtration because they are inexpensive and have superior performance characteristics. Replacement Parts - Filtration Systems. For Models: AP801, AP801-1.5, AP802, AP802-1.5 and Purwater FHOBB systems . Fits all new Models. This gasket is round not flat. 68898-31 IS NO LONGER AVAILABLE AND THIS GASKET WILL NOT WORK IN ITS PLACE. THERE IS NO REPLACEMENT FOR THE 68898-31.