The AO Smith Water Softener Controller is a plastic device designed specifically for household use with AO Smith water softener systems. It comes in a pack of 1 and is compatible with AO Smith models. This controller is essential for managing and regulating the water softening process in your home, ensuring clean and soft water for various household needs. Made by the trusted brand A. O. Smith, this water softener controller is a reliable and efficient component for maintaining your plumbing and water filtration system.