Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MUF221 found under Muffler Exhaust by Curtiss Wright Electro Mechanical Corporation Dba Steam And Air Solutions Div Cu. The National Stock Number assigned to this part is 2990004605779, and the Federal Supply Class is 2990 Miscellaneous Engine Accessories Nonaircraft. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like MUF221.