Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number VID 181559 found under Valve Flow Control by Ems Technologies Inc. The National Stock Number assigned to this part is 4820014816300, 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 VID 181559.