Superb Wrench SPBW-9 Heavy Duty Metal Water Filter Wrench (3.5 inch Inside Diameter) Inside Diameter: 3.5 in. Heavy duty 7-gauge zinc-plated steel Fits: Ametek, US Filter, Culligan, Crystal Quest, Plymouth, Kleen Plus, American Plumber, Bruner, Aqua-Pure AP1610SS, AP2610SS, SSTI, SSTIHA, SST2HB Handle is rubberized and longer than a standard filter wrench which gives you extra leverage Made in the USA