Preserve and protect household plumbing and water-using appliances with the Culligan HF-150A Whole House Sediment Water Filter. Installed on the 3/4-inch main water line at the point of entry, this filter housing features a pressure relief button used at cartridge change time. The UV-resistant opaque filter material facilitates outdoor installations when necessary. Because water quality varies among locations, the HF-150A is sold without a filter cartridge. The HF-150A is easy to install and maintain, and it's backed by Culligan's reputation for quality and performance.