Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number F171-2180-3 found under Valve Regulating Fluid Pressure by Ilc Dover Lp. The National Stock Number assigned to this part is 4820014284391, 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 F171-2180-3.