Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number D631-606C found under Servovalve Hydrauli by Moog Inc. The National Stock Number assigned to this part is 4810014932551, 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 D631-606C.