Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1421-0000 ITEM 34 REV 1 found under Heating Element Electrical Nonim by Mcl Industries Inc. The National Stock Number assigned to this part is 4520015126108, 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 1421-0000 ITEM 34 REV 1.