Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number R431006985 found under Piston Shaft by Aventics Ltd. The National Stock Number assigned to this part is 4820011799920, 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 R431006985.