Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1U-5551 found under Valve Extension Tire by Finning Inc. The National Stock Number assigned to this part is 2640015516511, and the Federal Supply Class is 2640 Tire Rebuilding And Tire And Tube Repair Materials. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 1U-5551.