Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number A1171TT1 1-2IN found under Valve Flow Control by Metso Automation Usa Inc. The National Stock Number assigned to this part is 4820004412594, 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 A1171TT1 1-2IN.