Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number FS4X4-1600-35 found under Switch Liquid Level by Hoffer Flow Controls Inc. The National Stock Number assigned to this part is 5930011596151, and the Federal Supply Class is 5930 Switches. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like FS4X4-1600-35.