Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 21B2040-1 found under Liner Assy Cylinder by Coltec Industries Inc. The National Stock Number assigned to this part is 2815004994672, 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 21B2040-1.