Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 3-31596 found under Tube Metallic by Diamond Power International Inc. The National Stock Number assigned to this part is 4710012068413, and the Federal Supply Class is 4710 Pipe Tube And Rigid Tubing. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 3-31596.