Superb Wrench SPBW-6 Metal Water Filter Housing Wrench (3.86 inch Inside Diameter) 3.86 inch Inside Diameter Made of heavy duty 7 gauge steel that will not break, bend or strip the water filter housing unit Fits: Aqua Pure AP11, AP101, AP11S / AP-11S, AP11T / AP-11T, AP12S / AP-12S, AP12T / AP-12T, AP26S / AP-26S, AP51T / AP-51T, AP101S / AP-101S, AP101T / AP-101T, AP102S / AP-102S, AP102T / AP-102T, Cuno CFS11, CFS11T, CFS01LG, CFS01TLG, CFS12T, CFS02LG Handle is rubberized and longer than a standard filter wrench which gives you extra leverage