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Every water installation must be checked after completion. When piping radiators, just like when installing a drinking water pipe, a pressure test must be carried out using a suitable pressure tester. A pressure test can be carried out with oil, water or air. For the sake of simplicity, water is usually used. We show the process in this video. If you like our videos, please give us a nice rating on Google or Maps: https://goo.gl/maps/x2hQPt3HQs9bfG5C8 We would be very happy to receive a donation to support our work on YouTube. You can donate to the following PayPal account: [email protected] or the link: http://paypal.me/ImmoSchoen