Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 393-033779-025 found under Heating Element Electrical Immer by Chromalox Corp. The National Stock Number assigned to this part is 2590003335501, and the Federal Supply Class is 2590 Miscellaneous Vehicular Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 393-033779-025.