Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number BP04-40-8SS found under Breather by Fluid Line Products Incorporated. The National Stock Number assigned to this part is 2520015374700, and the Federal Supply Class is 2520 Vehicular Power Transmission Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like BP04-40-8SS.