Superb Wrench SPBW-18 Heavy Duty Metal Water Filter Housing Wrench (4.24 inch Inside Diameter) Inside Diameter: 4.24 in Replaces the plastic SW-1 wrench Fits: Pentek #150539, Slim Line, Culligan, US Filter, Plymouth, Kleen Plus, American Plumber, Bruner and Ametek # 150294 Handle is rubberized and longer than a standard filter wrench which gives you extra leverage Made in the USA