
These are pneumatic quick - connect fittings, with a black main body and some parts matched with metal components. They are used in pneumatic systems and can quickly and conveniently connect air hoses without tools. There are various structural forms such as straight - through, tee, four - way, L - type, etc., which can adapt to the requirements of different air hose directions, flexibly change the air flow path, facilitate the installation, maintenance and expansion of the system, and are widely used in pneumatic circuits such as automation equipment and pneumatic tools, improving the efficiency of air circuit connection and the flexibility of the system.