The FullFloXF Backwash Valve is compliant with 2", 2-1/2"or 3" and easily retrofits to Triton, Quad D.E., FNS Plus, System 3, and System 2 Mod D.E. Filters. Features: Valve works with D.E. or Sand Filters Valve body constructed of high quality corrosion-resistant PVC Incredibly low pressure loss significantly reduces the amount of energy used Title 24-compliant for 2", 2-1/2" or 3" plumbing Robust design assures years of trouble free operation Available with unions that allow easy adaptation to all Pentair and Sta-Rite back Washable filters Available without unions Comfort grip over-molded large handle 3" OD and 2.5" ID ports Full unrestricted straight through 2.5" flow Removable end caps for servicing ease Molded in markings and text to show handle position and port labeling