Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number R2040-42AA-2KM 911-444 10IN found under Valve Butterfly by Norriseal. The National Stock Number assigned to this part is 4820007321869, 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 R2040-42AA-2KM 911-444 10IN.