The FEBCO F2813 is a 1" 860 Reduced Pressure Zone Backflow Preventer Assembly, Quarter Turn, Union. FEBCO Series 860 Small reduced pressure zone assemblies feature a flood sensor with SentryPlus Alert® Technology to detect excessive water discharge from the relief valve. Activated through an add-on connection kit, the sensor also triggers the alert system sending notification of flood detection to facility personnel. Connection kits are available for BMS and cellular communication.