This product is intended for use in IDL Heaters that were manufactured after September 20, 2004. It is more convenient to use and install. 【Scope of application】：Designed For Use In Hayward H-series Low Nox Heaters.Fits For Hayward Universal H-series Low Nox Pool Heater Models H150fdn、H150fdp、H200fdn、H200fdp、H250fdn、H250fdp,Fits For Hayward Universal H-series Low Nox Pool Heater Models H250fdn、 H250fdp、H300fdn、H300fdp、H350fdn、H350fdp、H400fdn、H400fdp.
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