Feature APPLICATION: This HAXHLI1930 sensor and FDXLHLI1930 high limit replacement kit is compatible with Hayward Universal H-series Low Nox pool heater models H150FDN, H150FDP, H200FDN, H200FDP, H250FDN, H250FDP, H300FDN, H300FDP, H350FDN, H350FDP, H400FDN, H400FDP, H500FDN, H500FDP. FUNCTION: The 135 degree Fahrenheit high limit heater part kit is fit for Hayward Universal H-Series H150FD, H200FD, H250FD, H300FD, H350FD, H400FD, H500FD Low Nox Pool Heater. REPLACEMENT: The high-limit pool heater parts kit replace for Hayward H-Series high-limit kit, replacing the OEM part NO. FDXLHLI1930. MATERIAL: .