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The Pentek 151122 O-Ring is an FDA-grade Buna-N replacement seal engineered for Big Blue and Heavy-Duty filter housings across major brands. This 5.5-inch inner diameter ring ensures a leak-proof seal when properly lubricated and installed according to manufacturer guidelines.
SPECIFICATIONS
Pentek 151122 O-Ring Technical Details
| Model Number | Pentek 151122 |
| Material | FDA-Grade Buna-N (Nitrile Rubber) |
| Inner Diameter (ID) | 5.5 inches |
| Outer Diameter (OD) | 5.75 inches |
| Housing Compatibility | #10 and #20 Big Blue Filter Housings |
| Replaces | W10-OR, OR-100 Culligan O-Rings |
| Not Compatible With | Pentek Big Clear Housings |
INSTALLATION & USE
How to Replace Your Filter Housing O-Ring
- Turn off water supply and depressurize the housing by opening the pressure relief button or valve
- Remove the old O-ring and clean the groove thoroughly with a damp cloth to remove any debris or residue
- Apply a thin coat of food-grade silicone lubricant to the new Pentek 151122 O-ring
- Seat the O-ring evenly in the housing groove, ensuring it sits flat without twists or folds
- Hand-tighten the housing sump and gradually restore water pressure while checking for leaks
COMPATIBILITY
Compatible Filter Housing Brands
The Pentek 151122 O-Ring fits Big Blue and Heavy-Duty #10 and #20 filter housings from Pentek, Culligan, Ametek, US Filter, Plymouth Products, Kleen Plus, and American Plumber. This cross-brand compatibility makes it a reliable replacement seal for most standard 10-inch and 20-inch Big Blue housings. Note that this O-ring is not designed for Pentek Big Clear housings, which require a different seal dimension.
🔧 Pro Tip: Inspect your O-ring every time you change the filter cartridge. Even small cracks or stretching can cause slow leaks that waste water and reduce system pressure. Keep a spare Pentek 151122 on hand so you're never caught without a replacement during routine maintenance.
