Hayward HMXHLI2932 Immersion Hi-limit Rear Header Replacement for Select Hayward H-Series Pool Heater Immersion hi-limit rear header replacement Fits hayward universal h-series low nox pool heater models h150fdn, h150fdp, h200fdn, h200fdp, h250fdn, h250fdp, h300fdn, h300fdp, h350fdn, h350fdp, h400fdn,h400fdp Also fits h-series millivolt and electronic pool heater models h1501, h150p1, h2001, h200p1, h2501, h250p1 160 Degree fahrenheit hi-limit Weighs 2-1/2-pound