Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number D2059 found under Valve Vacuum Breaki by Insinger Machine Company The. The National Stock Number assigned to this part is 4820012153188, 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 D2059.