Preserve and protect household plumbing and water-using appliances with the Culligan? HF-360A Whole House Valve-in-Head Water Filter System with P5 cartridge. Installs on the 3/4-inch 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. The filter housing comes with a 5-year limited warranty.