Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number BK104 found under Valve Poppet Engine by Rexarc International. The National Stock Number assigned to this part is 2815003523054, and the Federal Supply Class is 2815 Diesel Engines And Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like BK104.