FDXLTER1930 replacement thermistor
Fits Hayward universal H-series low nox pool heater models H150FDN, H150FDP, H200FDN,H200FDP, H250FDN, H250FDP
Also fits Hayward universal H-series low nox pool heater models H300FDN, H300FDP, H350FDN, H350FDP, H400FDN, H400FDP