Protects valuable appliances and plumbing fixtures. Ideal for well-water applications. Reduces extra-fine sand, dirt, and silt, rust and scale particles. Fits w34-Pr and WVC34 filter housings. Also fits Pentek Standard and Slim Line, Culligan, 3M/Cuno/Aqua-Pure, Filterite, Keystone Filter, Omnifilter, Watts and most standard size filter housings.