Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 0018-1684-000 found under Valve Regulating Fl by Gea Mechanical Equipment Us Inc. The National Stock Number assigned to this part is 4820014079330, 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 0018-1684-000.