Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 011-1979 found under Modification Kit Valve by Fm Industries Inc. The National Stock Number assigned to this part is 4810013258537, and the Federal Supply Class is 4810 Valves Powered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 011-1979.