Pipe Tube Expander, ST-22 Manual Iron Zinc Alloy Universal Hand Refrigeration Tools Pipe Swaging Tool for Air Conditioner Install Maintain Repair: Amazon.com: Tools & Home Improvement
B&T Metall Galvanised steel round tube, diameter 21.3 x 2.6 mm (1/2 inch), length approx. 0.5 m, construction tube ST 37, hot-dip galvanised, hollow profile : Amazon.de: DIY & Tools