Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 571L139-7D found under Packing Ring Assemb by Curtiss Wright Electro Mechanical Corporation Dba Steam And Air Solutions Div Cu. The National Stock Number assigned to this part is 2825004217502, and the Federal Supply Class is 2825 Steam Turbines And Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 571L139-7D.