Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number R49172 found under Guard Muffler Exhau by Curtiss Wright Electro Mechanical Corporation Div Steam And Air Solutions. The National Stock Number assigned to this part is 1560003517544, and the Federal Supply Class is 1560 Airframe Structural Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like R49172.