Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 19X31 found under Adapter Compressed Gas Cylinder by Union Carbide Corp. The National Stock Number assigned to this part is 8120006956001, 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 19X31.