Universal parts for the air brake and air lines of trucks, buses, trailers and passenger vehicles. The range includes palm couplings, also called gladhands, which join the air brake lines between a tractor and its trailer, and push-in pipe connectors for air line plumbing. The palm couplings have a cast metal body with a threaded port, a flat metal coupling face and a coloured hinged cover, offered in red and in yellow, the colours commonly used to tell the supply and control lines apart. The pipe connectors include a black T-shaped push-in tee for joining three air lines.