Special Air Hose Connector Design: Designed to be rotatable to prevent hose twisting and to secure the tool onto 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 systems. Suitable for use with pneumatic tools, in the automotive industry, with air compressors, and in mechanical engineering applications. 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 connectors, 2 x 1/4 BSP male connectors.