Easily installs on 1/2" or 3/4" main cold water line, reduces sediment including dirt, sand, silt, rust and scale particles to extend life of household fixtures and appliances. Eliminates need for additional shut-off valves on cold water lines; half-turn of handle on filter cap shuts off water flow to filter for hassle-free cartridge replacement. Clear to allow monitoring of cartridge life. Dynamically sealing, self-cleaning o-rings prevent leaks and clogging. Use with Nos.CW-MF, S1A, CW-F, or P5 filtercartridges, No.OR-34 replacement o-ring, and/or No.UB-1 mounting bracket. NSF International tested and certified.