Trachea connection: This gas hose connector offers a smooth, clean appearance with an even, tight build that provides a firm connection without damaging copper piping. It is well suited for connecting or extending a standard trachea. quality hose connector: The double joint of the gas hose adapter is built from quality brass, with precise threads, durable and rustproof construction, and corrosion and temperature resistance to ensure a long service life. Easy to install: Straight hexagonal nipple coupling for simple installation and removal. Align the interface and tighten a few turns without welding. Packing list: Included are 6 pieces of 1/4 inch brass double nipples with male thread for air pipe connectors. The gas quick coupling uses a lefthand spiral, which differs from the more common righthand thread. Please confirm compatibility before ordering. Applications and use scenarios: Extending or repairing standard trachea or air hoses in workshops or garages to reach tools and equipment without compromising seal. Replacing damaged connectors on gas or air hoses in barbecue, welding, heating, or DIY setups, with reliable brass construction for longevity. Creating easytoassemble, nonwelding connections in temporary or semipermanent gas/air piping installations that require a lefthand threaded coupling.