Yellow copper automatic lubricator, mainly connected to the air inlet interface in the pneumatic tools. 1/4 thread interface pneumatic automatic oiling device Specifications: Material:copper Color:gold Length: 55mm(2.24"） diameter: 30mm（1.18"） Connector size: 1/4 internal thread +1 / 4 external thread Features: -Used to connect the pneumatic pipeline between the tool and the air compressor, automatic oiling -With the filter oil water function and automatic oil supply function, prevent pneumatic tools do not refuel -Easy to connect all kinds of pneumatic tools.