• Features a flood sensor with SentryPlus Alert technology to detect excessive water discharges from the relief valve
• Alert features available with add-on sensor connection kit
• 304 (Schedule 40) stainless steel housing and sleeve
• UL and FM outside stem and yoke resilient seated gate valves
• Replaceable check disc rubber
• Bottom mounted cast stainless steel relief valve
• Compact design allows small enclosures to be used
• Groove couplings for ease of installation and pipe alignment
• The maximum working pressure is 175 psi (12.06 bar)

This 4 inch reduced pressure zone assembly backflow preventer help stop the reverse flow of liquids due to backpressure or backsiphonage, where potential health hazard exists. This extremely compact and lighter than a traditional designed assembly is approved for horizontal N pattern installation as long as the backflow assembly is installed in accordance with the direction of the flow arrow. This assembly consists of a stainless steel body with a quick access sleeve, torsion spring check valves, grooved gear operated butterfly valves with tamper switch, test cocks and corrosive resistant stainless steel bottom mounted pressure relief valve. This backflow assembly contains a flood sensor with SentryPlus Alert(R) technology to detect excessive water discharges from the relief valve. When activated through an add-on sensor connection kit, the flood sensor relays a signal that triggers notification of potential flooding to service personnel. The add-on sensor connection kit is available for building management systems and cellular communication.