The FEBCO F683009 is a 1 1/2" LF825 Reduced Pressure Zone Backflow Preventer Assembly, QT, Y Pattern. Series LF825YA Lead Free* 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.