Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number ALT-187 found under Cylinder Compressed Gas by Structural Composites Industries Llc. The National Stock Number assigned to this part is 8120013221925, 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 ALT-187.