Usage Tips:Function These compressed air quick connectors are widely used in the connection between pneumatic devices and air pipe to prevent air leakage. These compressed air quick connectors are made from iron. Chrome surface for corrosion resistance and good sealing. Easy to use Easy to install, simply slide the collar back and insert the fitting, then push the collar all the way back to lock it in place.Easy to carry The size is small, takes up little space, and is convenient to carry and store. Reduces accidental disconnection of air line. Wide application Widely applied to pneumatic tools, automobile industry, air compressors, mechanical engineering, etc. Features: Made from iron for strength and durability. They can reduce accidental disconnection of air lines when changing between tools. These quick couplings have been designed for convenient connection and disconnection of hoses. Specifications: Product name: Quick connector for compressed air Size: As shown Material: Iron Color: Silver The package includes: 4 x SH20 Compressed air female quick connector 4 x PH20 Compressed air male quick connector Notes: Please measure the inner diameter of the connected trachea carefully before paying. Please allow slight error due to manual measurement. Thank you for your understanding. Delivery quantity: 8 pieces Product color: silver Product size: diameter 9mm Note: manual measurement, please allow 1 - 3cm error!!!