Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 83D35 SIZE 12 found under Unit Heater Air Circulating Stea by Mulberry Metal Products Inc. The National Stock Number assigned to this part is 4520004984173, 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 83D35 SIZE 12.