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Plumbing Tip #41: How to remove and prevent airlocks in pipes

If you enjoy cold and hot water supply, then it is possible that one is connected to the mains. We can use the greater pressure that is normally the cold water supply to push any airlocks back to the hot water storage tank. Firstly, disconnect the cold water hose and connect the free end to the free, hot valve. Turn on the hot water valve and then the cold water valve. This will now allow the greater pressure of the cold water to push any air back up the hot water pipe. You should then leave both valves open for about 30 seconds and then close, cold first. Now check the flow and the air should have been dispelled. If this does not work, repeat the action. If after three attempts, the problem is still there, you should contact a plumber.