Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 3U3173-107 found under Valve Rotary Select by Woodward Machine Corporation. The National Stock Number assigned to this part is 4820003133307, and the Federal Supply Class is 4820 Valves Nonpowered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 3U3173-107.