Preserve and protect household plumbing and water-using appliances with the Culligan WH-S200-C Whole House Standard Duty 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 features stainless steel reinforced inlet/outlet and cap for added durability and is designed with a convenient built-in bypass valve to stop the water flow at cartridge change time. A filter life indicator is built into the filter head which alerts you when you need to change your filter cartridge. For ease of cartridge change, a housing wrench is included.