Package includes: There are 4 pieces 2 kinds of male/female compressed air quick coupler, 2 ordinary SH20 and 2 ordinary PH20. High quality material: these compressed air quick coupler are made from high quality iron. Nickel-plated surface for rust, corrosion resistance and a good seal. Easy to install: just push back the snap ring and insert the pipe fitting plug . Be sure to put the snap ring back in the position lock to quickly connect or disconnect the tool and air line. Wide Application: These compressed air quick couplers are widely used in the connection between pneumatic devices and air hose. Specification: Product name: compressed air quick coupling Material: iron with nickel-plated surface Color: silver Product Description: These compressed air quick connectors are widely used in the connection between pneumatic devices and the air hose. With a nickel-plated surface, these compressed air quick connectors provide good airtightness, rustproof and corrosion resistant. Package Contents: 2 x SH20 female compressed air quick coupler 2 x PH20 male compressed air quick coupler Note: 1.Please carefully measure the inner diameter of the connected trachea before paying. 2. Please allow slight errors due to manual measurement. Thank you for your understanding. 3. Monitors are not calibrated the same. Item color displayed in photos may be showing slightly different from the actual item. Please take the real one for reference.