Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number TU400 MIL-I-631 PVC found under Tubing Nonmetallic by Grimes Aerospace Company. The National Stock Number assigned to this part is 4710016675858, 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 TU400 MIL-I-631 PVC.