Culligan HF-150A Standard Duty Whole House Sediment Water Filter Housing, 3/4"Whole House opaque system with pressure relief valve to protect appliances from sediment and scale. Filters all water entering your home. Traps sediment, reduces scale that can clog faucets and ruin plumbing. Whole house sediment water filter Pressure relief valve Installs easily on 3 4" main water lines Filters all water entering your home Reduces dirt, sand, silt, rust and scale particles to extend life of household fixtures and appliances Traps