The APEC Water Solutions WSC-FCV68D3-A Digital Valve Water Softener Controller is a black digital valve designed specifically for APEC Water Solutions systems. It is suitable for household use and comes as a single pack. This controller model is compatible with Apec Water Softener Systems, providing an efficient way to control and regulate water filtration in your home. With its advanced technology and reliability, this digital valve offers a convenient and effective solution for maintaining clean and soft water in your household.