How to Increase Your Hot Water Capacity with a Mixing ... - hot water mixing valve
FROM FEBCO'S SITE: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).
THIS NOW COMES WITH A FREEZE SENSOR. IT IS DESIGNED TO BE WORKED WITH ANOTHER SYSTEM, HOWEVER, IT IS NOT REQUIRED TO USE THIS ASSEMBLY AS IT HAS ALWAYS BEEN USED.
8615510865705 
8615510865705