Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number EP4 32IS-277 found under Ballast Lamp by Howard Industries. The National Stock Number assigned to this part is 6250014432232, and the Federal Supply Class is 6250 Ballasts Lampholders And Starters. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like EP4 32IS-277.