Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number R600-91B found under Diaphragm Fuel Pump by Donallco Inc. The National Stock Number assigned to this part is 2915000356980, 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 R600-91B.