Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number FS3-1 2X3-2000 found under Detector Flow Switc by Hoffer Flow Controls Inc. The National Stock Number assigned to this part is 1440013304666, 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 FS3-1 2X3-2000.