Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 18D50 found under Valve Poppet Engine by Mechanical Equipment Company Inc. The National Stock Number assigned to this part is 2815004301102, 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 18D50.