Thunder-lock is a revolutionary weldless connection for rigid pipes, providing the same reliability as welding without the associated risks and costs. The tube is permanently formed and sealed to the end termination by means of a cold expansion process using a compact portable tool, not requiring a specialised technician. In addition to reduced costs and ease of use, some of the other benefits of the process offered are a high degree of safety through minimised injury risk without the need for fire-fighting supervision while providing a leak-free pipeline solution. Thunder-lock makes possible the easy and fast connection of pipelines, even in confined spaces, such as those found on board ships, representing the best alternative to welding and in compliance with the stringent requirements in both the naval and military fields. Thunder-lock is designed with safety back-up o-ring to prevent internal corrosion due to external contaminants.