Part Number 121978 having (CAGE Code 50870) and FSC 2990 Miscellaneous Engine Accessories Nonaircraft in stock with ready to ship. Get an instant quote for 121978 Duct Assy Heater by Arnold A Semler Inc. Fill the form below with your desired order quantity, targeted price and the expected order-fulfilment date. Our dedicated account manager will get back to you within 15 minutes.