1、On Off Control Valve: The elbow gas adapter is equipped with on off control valve, prevents gas leakage when connecting cylinder, and easily controls the filling process. 2、Easy Connection: The propane filling adapter has handwheel handle for tightening, making it easy to connect large steel cylinder to a 1LB propane tank. 3、Quick Monitoring: Quickly check the remaining gas in your large gas tank to avoid inconvenience caused by insufficient gas during the refueling process. 4、Brass Material: This gas adapter adopts solid brass material, providing good sealing effect and corrosion resistance, and can be used in various environments. 5、Convenient Use: The 1lb bottle can be easily filled multiple times without tools, and the built in safe function effectively prevent the danger of overinflating the cylinder.