Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number F4T20B found under Spacer Pump by General Signal Corp. The National Stock Number assigned to this part is 5365003985751, and the Federal Supply Class is 5365 Bushings Rings Shims And Spacers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like F4T20B.