Easily installs on 1/2 in or 3/4 in main cold water line, reduces dirt, sand, silt, rust and scale particles to extend life of household fixtures and appliances. Constructed of opaque polypropylene for added durability. Dynamically sealing, self-cleaning o-rings prevent leaks and clogging. Use with Nos.CW-MF, S1A, CW-F, or P5 filter cartridges, No.OR-34 replacement o-ring, No.SW-2 filter housing wrench, and/or No.UB-1 mounting bracket (Orgill sku# 658.9006). NSF International tested and certified.