Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number F10021A found under Valve Check by Martin Decker Totco Inc. The National Stock Number assigned to this part is 4820012152134, and the Federal Supply Class is 4820 Valves Nonpowered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like F10021A.