Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 155-071172-073 found under Heating Element Electrical Immer by Chromalox Corp. The National Stock Number assigned to this part is 4410014202505, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 155-071172-073.