Description
The Pentek 151254 “Square-Cut” O-ring is used to seal water filter housings. It has an inside diameter of approximately 5.40 inches and outside diameter of approximately 5.65 inches. This o-ring is made of nitrile butadiene rubber (Buna-N) for flexibility and resistance to abrasion and tearing.
Compatible with the following filter housing models:
- 3M AquaPure filters that require part number 68898-31 (including older AP801 housings that use the square cut o-ring)
- American Plumber W10-BC, W15-BC, 152080
- Ametek HD10-CL
- Omnifilter BF9, BF9C
- Pentek 10-BC, 20-BC, 166219, 166201
- Pentek 10” Big Clear (10” only, not the 20”) and Big White Housings that require the “square-cut o-ring”
The 151254 o-ring is a direct replacement for the following part numbers:
- 3M AquaPure 68898-31
- American Plumber WBC-OR
- Omnifilter OK8
- Pentek 151254
Includes three (3) Square-Cut O-Rings in a resealable zip-top poly bag with “Captain O-Ring” branded packaging.
Manufactured and warrantied against defect for one year by Captain O-Ring LLC. Proudly assembled in the USA!



