LF800M4QT
LF800M4QT. Lead-Free* Antisiphon Pressure Vacuum Breaker Backflow Preventers with Freeze Sensor, Sizes: 1/2 IN - 2 IN (15mm – 50mm) Series LF800M4QT Lead-Free* antisiphon pressure vacuum breakers include a freeze sensor for use with SentryPlus Alert® technology to monitor temperature nearing the freezing point.