Watts T387122 2" Bronze Anti-Siphon Pressure Vacuum Breaker Backflow Preventer with QT Shutoff - This 2" anti-siphon pressure vacuum breaker backflow preventer helps prevent the reverse flow of polluted water from entering into the potable water supply due to backsiphonage. It is ideal in health hazard continuous pressure applications such as irrigation systems and industrial process water systems where the water enters the equipment at or below its flood rim. It has a maximum pressure of 150 PSI and a minimum pressure of 15 PSI. The pressure vacuum breaker 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/irrigation management systems (BMS/IMS).