Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MSA2-4IN found under Arrester Spark Exha by Beaird Industries Inc. The National Stock Number assigned to this part is 2990014230765, 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 MSA2-4IN.