Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number AZ2-4-1 found under Valve Expansion by Ellis And Watts International Llc. The National Stock Number assigned to this part is 4820008047488, 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 AZ2-4-1.