Superb Wrench Metal Water Filter Housing Wrench Number 17 Replaces SW-5 plastic wrench Inside Diameter: 3.62 in. Fits housing for Culligan US-600, SY-2300, SY-2300S, SY-2500, SY-2650, RO-3000, RO-3500, and SY-2000 and Fits American plumber under the sink housing Handle is rubberized and longer than a standard filter wrench which gives you extra leverage; Handle is also imprinted with a directional arrow to ensure proper removal of the housing unit. Made in the USA