The FEBCO T765HBV is a 2" 765 Pressure Vacuum Breaker Backflow Preventer, Quarter Turn, with a Freeze Sensor. Series 765 Pressure Vacuum Breakers includes a freeze sensor for use with SentryPlus Alert® technology to signal when ambient temperature approaches the freeze threshold. Activated through an add-on connection kit, the sensor also triggers freeze alerts to facility personnel. Connection kit available for building/irrigation management system (BMS/IMS).