Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number C31E2138 11 found under Hose Air Duct by D F P Manufacturing Corp. The National Stock Number assigned to this part is 4720011226724, and the Federal Supply Class is 4720 Hose And Flexible Tubing. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like C31E2138 11.