Easily installs on 1/2 in or 3/4 in 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. Dynamic sealing, self-cleaning O-ring prevent leaks and clogging. Use with No CW-MF, S1A, CW-F or P5 filter cartridges, No OR-34 replacement O-ring, and/or No UB-1 mounting bracket (Sku No 658.9006). NSF International tested and certified.Easily installs on 1/2 or 3/4 in main cold water line, reduces sediment including dirt, sand, silt, rust and scale particles to extend life of household fixtures and appliancesEliminates need for additional shut-off valves on cold water linesHalf-turn of handle on filter cap shuts off water flow to filter for hassle-free cartridge replacementClear to allow monitoring of cartridge lifeDynamically sealing, self-cleaning o-rings prevent leaks and clogging