Preserve and protect household plumbing and water-using appliances with the Culligan HF-360B Whole House Valve-in-Head Water Filter System with P5 cartridge. Installs on the 3/4-in. main water line at the point of entry. This filter housing is designed with a convenient built-in shut-off valve to stop the water flow at cartridge change time. The clear filter housing allows easy monitoring of cartridge life. For ease of cartridge change, a housing wrench is included.