Hayward FDXLFHA1930 FD Header Assembly Replacement for Hayward Universal H-Series Low Nox Pool Heater Fd header assembly. Common Union for Installation or Service, Adapts to Larger Plumbing Recommended for Greater Efficiencies 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 Weight 5.6 pounds