The Watts S7966-1 O-Ring delivers a reliable watertight seal for 10" and 20" full flow filter housings, preventing leaks and maintaining system pressure. Constructed from durable EPDM rubber, this round O-ring is engineered to withstand repeated housing changes and exposure to treated water.
SPECIFICATIONS
Technical Details
| Manufacturer | Watts |
| Model Number | S7966-1 |
| Material | EPDM Rubber |
| Shape | Round |
| Compatible Housing Size | 10" and 20" Full Flow |
| Application | Filter Housing Seal |
| Recommended Replacement | Every 2-3 filter changes or annually |
INSTALLATION & USE
Replacing Your Housing O-Ring
- Depressurize system and remove the filter housing sump from the cap assembly
- Remove the old O-ring from the groove and clean the groove thoroughly with a damp cloth to remove debris and buildup
- Lightly lubricate the new Watts S7966-1 O-Ring with food-grade silicone grease
- Seat the O-ring evenly in the housing groove, ensuring no twists or folds
- Reinstall the housing sump, hand-tighten firmly, and slowly restore water pressure while checking for leaks
COMPATIBILITY
Fits These Filter Housings
The Watts S7966-1 O-Ring is designed for Watts and Pentair full flow filter housings in both 10-inch and 20-inch configurations. This includes standard 3/4" and 1" inlet/outlet full flow housings commonly used in whole house water filtration systems. Verify your housing manufacturer and size before ordering, as standard and slim-line housings use different O-ring profiles.
🔧 Pro Tip: Keep a spare O-ring on hand and replace it any time it appears flattened, cracked, or loses elasticity. A compromised O-ring is the most common cause of housing leaks, and replacing it during routine filter changes prevents unexpected failures.
