Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number S147AV found under Mufflerexhaust by Air Vac Engineering Company Inc. The National Stock Number assigned to this part is 2990016908425, 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 S147AV.