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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