Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 155 522 581 found under Stem Needle Valve by Georg Fischer Llc. The National Stock Number assigned to this part is 4820015268718, 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 155 522 581.