JACO is a set of two air chucks that allow connection to tire valves for pressure monitoring and inflation. They provide a sealed connection between the tire and the air hose and measure pressure without air leaks. Each chuck is made of metal with anti-corrosion properties. Inside, there is a spring-loaded locking mechanism that ensures a tight grip on the valve. Connection to the pump is done via a standard 1/4-inch fitting. The mechanism is designed for use under high pressure.