Asmr plumbing video on How to fix a pin hole leak in copper pipe! Testing ct1 miracle on a 1mm hole in a piece of copper pipe. Pour a bit of the sealer with some water and pressurise up to 1 bar! This stuff seals the leak and allows you to keep the pressure in a heating system until you find it to repair! Great for leaks on heating systems with pipework underground. If you drain the system it needs to be readded. No good on hot and cold pipework as it gets flush through every use! | Mmplumber