The Superb Wrench heavy duty metal water filter housing wrench replaces the plastic wrench that typically breaks when removing the filter housing unit. Made of heavy duty 7-gauge steel, the Superb Wrench will not break, bend or strip the housing unit. The handle is rubberized and longer than a standard filter wrench which gives you extra leverage, along with the word "loosen" and an arrow imprinted to ensure proper removal of the housing unit. Make filter changing easy, get your Superb Wrench today. Inside Diameter: 4.28 in. Fits: Universal Slim Line Housings, Flexeon - Axeon Double O Ring, LT Series, LT 200, LT 300, TF R.O. Systems, 4 Stage, 5 Stage, 6 Stage and Residential R.O. Systems