Feature: 1. COUPLER PLUG: The air hose fittings include 2 3/8 body air couplers with 3/8in NPT thread and 2 3/8 body air plugs with 3/8in NPT thread 2. 3/8IN HIGH FLOW BODY: This air connector is suitable for high flow air tools, with 3/8in bodies providing up to 70% more air flow than 1/4in bodies 3. COMMON USE: The air coupler plug kit connect with accessories of the same type and size from other brands. Maximum operating pressure of 300PSI, temperature up to 250 degrees Fahrenheit 4. SIX LOCKING BALLS: There are six locking balls in the connector to securely secure the plug. Socket guards help reduce the possibility of accidental disconnections 5. DURABLE CONSTRUCTION: The heat treated steel structure of air hose connectors fittings has high corrosion resistance and long service life. Thickened coating for increased durability and reliability Specification: Item Type: Air Coupler Plug Kit Joint Size(male or female): 3/8in NPT Access Type: Fast connect Application: Air hose quick connection connector. Package List: 4 x Air Coupler Plug Kit Note: Ensure that the desired thread size is 3/8in NPT thread.