Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number EX20B9 2 found under Regulator Voltage by Allied Signal Inc. The National Stock Number assigned to this part is 6110008645017, and the Federal Supply Class is 6110 Electrical Control Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like EX20B9 2.