Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4561-1 found under Stem Needle Valve by Siemens Moore Process Automation. The National Stock Number assigned to this part is 4820007887593, 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 4561-1.