Special Air Hose Connector Design: Rotatable design helps prevent hose twisting and secures the tool to the air hose. The female connector features a valve to prevent air leakage during tool changes. Compatibility: 1/4 inch compressed air fitting accessories, compatible with PCL, Vertex, Airflow, and other standard pneumatic systems. Suitable for use with pneumatic tools, air compressors, automotive applications, and mechanical engineering. High-Quality Materials: Constructed from galvanized steel for durability and resistance to rust and corrosion. Easy to Install: 1/4 inch quick coupler allows for fast and simple connection and disconnection of tools and air lines. Installation is straightforward—slide the clamp back and insert the connector. Package Includes: 4 x 1/4 BSP female connectors, 4 x 1/4 BSP male connectors, 2 x 1/4 BSP female threaded adapters, 2 x 1/4 BSP male threaded adapters.