Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 47B MLB-252-020 found under Shutdown Engine Eme by Textron Marine Systems. The National Stock Number assigned to this part is 2990015571551, 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 47B MLB-252-020.