For over 85 years, Culligan knows every drop of water flowing through your home is important and is an expert in home water filtration systems. Provide your family with visibly clean, great-tasting water for drinking, cooking and more. The Culligan HD-950A Heavy-Duty Whole House filter housing allows you to preserve and protect your household plumbing and water-using appliances. Designed for installations where a 1-inch water main is present at the point of entry, this filter housing features a pressure relief button used at cartridge change time. The large filter size provides 4 times the capacity where high sediment concentration is an issue. Because water quality varies among locations, the HD-950A is sold without a filter cartridge. The HD-950A housing uses filter cartridges CW5-BBS, CW25-BBS, CP5-BBS, P25-BBS, R50-BBSA, and RFC-BBSA. The unit comes with a 5-year limited warranty.