JJandy BWVL-NVL 2-in-1 Backwash Valve for DEV and JS Series Filter features a straight-through, full-flow port design that optimizes flow and hydraulic efficiency. A versatile valve, it connects to the Jandy Pro DEV and JS Sand Filters as well as most other filter brands. Versa-Coupler allows easy installation to fit any filter from 7'' up to 9'' inlet/outlet port distance. With its NeverLube technology, the valve requires no service and comes with a lifetime guarantee on the diverter seal.