The FEBCO F683005 is a 2" LF860 Reduced Pressure Zone Backflow Preventer Assembly, Quarter Turn. FEBCO Series LF860 Small reduced pressure zone assemblies feature a flood sensor with SentryPlus Alert® Technology to detect excessive water discharges from the relief valve. Activated through an add-on connection kit, the sensor can trigger the alert system sending notification of flood detection to facility personnel. Connection kits are available for BMS and cellular communication.