Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 15556 found under Plug Valve by Moog Inc. The National Stock Number assigned to this part is 1650006537734, and the Federal Supply Class is 1650 Aircraft Hydraulic Vacuum And De-Icing System Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 15556.