The 1 in. pressure vacuum breaker backflow preventer helps prevent the reverse flow of polluted water from entering into the potable water supply due to back siphonage. It consists of bronze body construction, silicone rubber check valve disc, plastic check valve seat, stainless steel springs, a bonnet with silicone rubber O-ring seal, a light-weight plastic disc float, tee handle or lever handle shutoffs and test cocks for Winterization draining. It is ideal in continuous pressure health hazard applications such as on irrigation systems and industrial process water systems. The pressure vacuum breaker includes a freeze sensor for use with SentryPlus Alert(R) 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).