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Hayward FDXLFOR1930 FD Heater O-Ring Replacement Kit for Hayward Universal H-Series Low Nox Pool Heater welding-face-shields-and-head-gear 110db Loud Alarm with 2XHayward FDXLFOR1930 FD Heater O Ring Replacement Kit for Hayward Universal H Series Low Nox Pool Heater Fd heater o ring kit 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 0. 8 pounds