FEBCO T765DBV 3/4" Series 765 Bronze Pressure Vacuum Breaker - 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. A connection kit is available for building and irrigation management systems (BMS/IMS). This series is designed to provide protection against back siphonage of toxic or non-toxic liquids. It features a durable bronze body, check valve and air opening port in one assembly.