Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 2050B found under Expander Tube by Dresser Rand Co. The National Stock Number assigned to this part is 3456001461425, and the Federal Supply Class is 3456 Cutting And Forming Tools For Secondary Metalworking Machinery. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 2050B.