Febco 1" RPZ Principal Assembly (Top Access) 1" 860 QT FS RP X49732 Professionals can also enable irrigation Professionals can also enable irrigation and check battery status right on the controller with the touch of a button The C 633 Series is a heavy duty wall hydrant designed for installation in mild climates Features a flood sensor with SentryPlus Alert technology to detect excessive water discharges from the relief valve This 1 inch reduced pressure zone backflow preventer assembly prevents the reverse flow of high hazard (toxic) fluids found in the water from entering into the potable water supply due to backsiphonage and or backpressure