Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number FVS40 found under Valve Foot by Mark Controls Corp. The National Stock Number assigned to this part is 4820012627530, 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 FVS40.