Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 90-00-80-00B found under Switch Toggle by Litton Systems Inc. The National Stock Number assigned to this part is 5930007903759, and the Federal Supply Class is 5930 Switches. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 90-00-80-00B.