HHT Heatilator IPI Pilot Assemlby Part #4021-584 Replacement natural gas (NG) pilot assembly for Hearth & Home gas stoves and fireplaces. This is an IPI pilot assembly, does NOT work with DSI, HSI or standing pilot units. Fits the following HHT gas fireplace models: Heatilator Gas Fireplaces: GBFL36I - Pre serial # GA1549727 GBST36I & GBST36LI - Pre serial # GA1549727 GDCH60I & GDCH60LI - Pre serial # GA1540727 GDCH60iV & GDCH60LiV GDCR60i & GDCR60Li - Pre serial # GA1548727 GDFL60I & GDFL60LI - Pre serial # GA1548727 GDST60i & GDST60Li - Pre serial # GA1548727 GDST60iV & GDST60LiV GDST5244I BCBR36 - After 14/03 CB4236IR - Pre serial # GA1563745 CB4842IR - Pre serial # GA1563745 CD4236IR & CD4236ILR - Pre serial # GA1563745 CD4842IR & CD4842ILR - Pre serial # GA1563745 CNXT70ET & CNXT70EH - After 12/03 CNXT70iH & CNXT70iT CNXT70iPLUS CNXT90ET & CNXT90EH - After 12/03 CNXT90iH & CNXT90iT GB4336i & GB4336iL GB4942i & GB4942iL GCBC60i & GCBC60Li GCBC80i & GCBC80Li GGBR60E & GGBR60LE - After 13/03 GGBR60I & GGBR60IL - After 12/03 GGBR80E & GGBR80LE - After 13/03 GGBR80I & GGBR80IL IB75 - After 16/03 HHT part # 4021-584 OEM Heatilator part.