An external thread universal connector is a multi-functional piping component based on a "male thread" as the base interface. Its core function is to flexibly convert a male threaded connection into various other types, such as female threads, quick-connect fittings, or nipple-style hose connectors, solving connection challenges between pipelines of different specifications and connection types. It is suitable for low- to medium-pressure applications involving the transfer of water, air, or neutral fluids. With high interface flexibility, the base end features a standard male thread (e.g., 1/2-inch or 3/4-inch), while the adapter end—through interchangeable fittings or integrated design—enables multiple configurations such as "male to female," "male to quick-connect," or "male to hose nipple," eliminating the need for stacking multiple single-purpose connectors.