Culligan Heavy-Duty Water Filtration System is designed to trap sediment and reduce scale before it enters your home, providing superior protection for your appliances, faucets, and plumbing. Featuring a 1-inch inlet and outlet, this system four times the capacity of standard-duty filtration systems, making it for homes, farms, and businesses with high water volume needs. The easy-install design ensures a hassle- setup, while the heavy-duty cartridge, sold separately, allows for customizable filtration. This reliable filtration system includes the HD-950A housing, SW-3A housing wrench, OR-100 O-ring, and installation instructions to get you started quickly and efficiently. Model Number: HD-950A