Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number S56-4138-048 found under Muffler Exhaust by Burgess Manning Inc. The National Stock Number assigned to this part is 2990015495642, 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 S56-4138-048.