Watts LF909-OSY-FP 4 - Part of the LF909 Large Series ADS It is UL classified

It is UL classified

designed for both residential and commercial applications

This second check valve kit is used to repair or replace the second check on a 4 inch lead free double check detector assembly and used to prevent the reverse flow of polluted water from entering into the potable water supply

It has a diaphragm

UPC - 098268581096

Watts LF909-OSY-FP 4 - Part of the LF909 Large Series ADS It is UL classifiedThis 4 inch lead free reduced pressure zone backflow preventer assembly with SentryPlus Alert technology with automatic shutoff ACV for flood detection and prevention is designed to prevent the reverse flow of contaminated water from being pumped or siphoned into the potable water supply due to backsiphonage and or backpressure in accordance with national plumbing codes and water authority requirements, as well as provide continuous monitoring, multi