Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 3904 found under Valve Extension Tire by Schrader Bridgeport International. The National Stock Number assigned to this part is 2640002042279, 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 3904.