Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NP5-27 found under Air Cylinder by D C Cooper Corporation The. The National Stock Number assigned to this part is 8120011416401, and the Federal Supply Class is 8120 Commercial And Industrial Gas Cylinders. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like NP5-27.