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Fits 2 inch ball valve
Z551-4IP-TG
50 Minimum Temperature-Fahrenheit 33 Outlet Connection Size 3 IN Outlet Connection Type Mechanical Joint Outlet Shutoff Valve Type Outside Stem And Yoke Gate Valve Outlet Thread Type Does Not Apply To Product Part Number 88009364 Polymer Coating No Pressure Operation Continuous Protection Type Backpressure and Backsiphonage Seat Material Stainless Steel Series 909RPDA Strainer No Technologies Flood Detection Tradename None Specification Sheet - 909RPDA
It has a 68 second cycle time
Watts 957NRPDA-OSY-CFM-FS 8 - Part of the 957RPDA Series Egress System Fits 2 inch ball valveThis 8 inch reduced pressure detector backflow preventer assembly help stop the reverse flow of liquids due to backpressure or backsiphonage, where potential health hazard exists. Extremely compact and lighter than traditional designs it is approved for horizontal installation. This assembly consists of a stainless steel body with a quick access sleeve, torsion spring check valves, resilient seated gate valves with outside stem and yoke, test cocks,