HF150A is used to preserve and protect household plumbing and water-using appliances, water heater, water softener, fixtures, and faucets with the Culligan model No. HF150A sediment filter. Installed on the 3/4" 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, where necessary. Because water quality varies among locations, the model No. HF150A is sold without a filter cartridge (not included). Refer to Model No. CW-MF (SKU 487155), S1, CW-F (SKU 426658), P5 (SKU 432652), or P1(SKU 463607) for replacement cartridge. Cartridge dimensions: 12.5" H x 5" W x 5" D. 5 year limited warranty.