Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number BA4317 found under Seal Tank Unit Fuel by Hutchinson Industries Inc. The National Stock Number assigned to this part is 1560009945271, and the Federal Supply Class is 1560 Airframe Structural Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like BA4317.