Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 20018 found under Valve Core by A Vox Systems Inc. The National Stock Number assigned to this part is 2640007561595, 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 20018.