Fitment:1, The 9003542 Water Heater Natural Gas Pilot Assembly solve these problems: water heater pilot light is always off, water heater not heating due to the thermocouple damaged, gas pilot assembly cannot work properly due to some other factors, intermittent heating, ignition not normal, Ignition heating efficiency is low etc.2, The Natural Gas Pilot Assembly replace 9003542, 183824-190, 9003530, 9003542005, 100109295, AP4867015 pilot assembly, Compatible with A.O.Smith FCV, GCV, GVR, XCV and XVR serials, compatible with Kenmore 153 series and State GS&GSX water heaters.3, Fit gas water heater models: A.O. Smith FCV40, FCV50, GCV30, GCV40, GCV50, GCVH30, GCVT40, GCVT40L, GCVT40Q, GVR40, XCV30, XCV40, XCV50, XCVH30, XCVL40, XCVT40, XCVT40L, XCVT40Q an.