Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 831665-12YAC found under Valve Tee by Automatic Switch Company. The National Stock Number assigned to this part is 4810004329554, 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 831665-12YAC.