Cast iron rear venturi 20-1/2" long, 2-1/8" dia w/air shutter a1188, # 26-1569 for lift off head, removable head only is # 24-1189, 4-3/4" dia. imperial range series: ir elite (with lift off burner heads). (most models made after 1996)

Fits Model Imperial: IHPA SERIES, IHPA-12, IHPA-2-12, IHPA-24, IHPA-3-36, IHPA-36, IHPA-4-24, IHPA-4-48, IHPA-48, IHPA-4_24, IHPA-6-36, IR SERIES, IR-10, IR-2000-24, IR-2000-36, IR-2000-48, IR-2000-60, IR-2000-72, IR-24, IR-36, IR-4-G12, IR-4-S18-XB, IR-48, IR-6, IR-6-C, IR-60, IR-72, IR-8

Replaces Part Number IMPERIAL: -1232, -2681, 1232, 2681, IMP1232, IMP2681