Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 31-AA4-4-9IN SS found under Hose Assembly Nonmetallic by Allied Systems Company. The National Stock Number assigned to this part is 4720013826587, 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 31-AA4-4-9IN SS.