Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number FLS-300-12D-54 found under Test Set Electronic Systems by Exfo America Inc. The National Stock Number assigned to this part is 6625015298995, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like FLS-300-12D-54.