Watts LF709 DNRS IOT 6 Part of the LF709 Series mainline adatile This 2 inch anti siphon pressure This 2 inch anti siphon pressure vacuum breaker backflow preventer helps prevent the reverse flow of polluted water from entering into the potable water supply due to backsiphonage the grates will rust over time forming a protective iron oxide patina that begins red orange and ages to a deep This assembly features integrated pressure sensing test cocks that measure pressure fluctuations at three points when activated with an add on monitoring connection kit a patented 3 part advanced epoxy coating system designed to limit both microbial induced (MIC) and exposed metal substrate corrosion