UKL Multiport Valves are critical components in the operation of many different types of water treatment and filtration systems, especially in swimming pool and spa filtration, as well as in some industrial and commercial applications. These valves are intended to control the flow of water within the filtration system while also performing numerous functions, generally with a single valve. The valve reverses the flow of water through the filter during backwash mode, washing collected dirt and debris out of the filter media and into a waste line. This UKL Multiport Valves assists in cleaning and extending the life of the filter material.