The Watts FH-WWF filter housing wrench eliminates the struggle of opening and closing standard 10-inch filter housings during cartridge replacements. This full-circle design provides even leverage across the entire housing rim, preventing the cracking and stripping that comes from improvised tools.
SPECIFICATIONS
Watts FH-WWF Housing Wrench
| Manufacturer | Watts |
| Model Number | FH-WWF |
| Housing Size | Standard 10-inch and 20-inch |
| Inside Diameter | 4.5 inches |
| Compatible Housing Dimensions | 3.5" bottom / 4.5" top |
| Style | Full circle |
| Material | Durable white plastic |
| Primary Compatibility | Pentair standard housings |
INSTALLATION & USE
How to Use the Housing Wrench
- Turn off water supply and relieve pressure by pressing the red pressure relief button on top of the housing
- Place the wrench over the top of the filter housing, ensuring the full circle sits flush against the rim
- Turn counter-clockwise to loosen and remove the housing sump, then replace your sediment or carbon filter cartridge
- Hand-tighten the housing back onto the cap, then use the wrench to snug it down with a quarter turn—do not overtighten
COMPATIBILITY
Works With Standard 10" Housings
The Watts FH-WWF wrench is designed for standard 10-inch and 20-inch filter housings with a 4.5-inch top diameter and 3.5-inch bottom diameter. It fits Pentair standard housings as well as most comparable Watts, Culligan, and generic big blue style housings. Measure your housing diameter before ordering to confirm fit—this wrench will not work with slim-line, jumbo, or oversized housings.
🔧 Pro tip: Keep the wrench near your filter housing so it's always available when you need it. Apply even pressure when loosening—if the housing is stuck, tap the wrench gently with a rubber mallet rather than forcing it, which can crack the plastic threads.
