Interlocking; Inline Knuckle Style Tube Connectors.
Great Fabricators know, sometimes you run into situations that you need the flexibility to have a removable section to make your design work. Such as, Engine and Transmission X-Members, Bed cage designs, Fuel Cell Can Restraints, Seat Supports. So if you are building a Trick-Truck, Prerunner, Rock Crawler, or any thing else with tubing, then these are what you need.