Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number AS2991 found under Valve Poppet Engine by Trw Inc. The National Stock Number assigned to this part is 2815000840534, 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 AS2991.