#R0719400 Jandy JXi LowNOx Heater, Rev. H Flu Sensor Description: Rev. H and Later Flu Sensor for JXI with Versa Flo Upgrade Kit Accommodates: Rev. G early model JXI400 Note: R0719500 (PIB) and R0719400 (Flue Sensor) must be field installed on JXi Heaters Serial Revision G and Earlier to be compatible with JXiVFKIT. JXi Heaters Revision H and Later have new PIB and flue sensor factory-installed. www.zodiacpoolsystems.com