Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B74-21 found under Fitting Fuel Shut O by New Sd Inc. The National Stock Number assigned to this part is 2915006138384, and the Federal Supply Class is 2915 Engine Fuel System Components Aircraft And Missile Prime Movers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like B74-21.