SIZE: 3/8 INCH Female NPT. High quality: Heat-treated steel with high strength and hardness, offering increased corrosion resistance and a longer lifespan, with a maximum working pressure of 300 PSI. MULTIFUNCTION: For switching quickly between different air tools and accessories with ease during applications. MATERIAL: Made of steel, working temperature can be from -65°F to250F. Easy TO INSTALL: 6 small balls are connected more closely，no need to resort to other tools, convenient for connection and disassembly.