Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 649-C-2001-3 found under Indicator Rate Of Flow by Hoffer Flow Controls Inc. The National Stock Number assigned to this part is 6680003211004, 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 649-C-2001-3.