Jandy BWVL-NVL-75 Valve Pre-Plumed with Unions. The Jandy 2-in-1 Backwash Valve features a straight-through, full-flow port design that optimizes flow and hydraulic efficiency. A versatile valve, it connects to the Jandy DEV, JS, and SFSM 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.