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i think the only way is to visual inspect it.

True but that is if you already know where the line runs and have a good idea where the leak is underground. However if you dont have this knowledge you will need to plot where your line runs and walk the area with a pole and look for a place that is excessively damp and probe the area with the pole not too hard or you may rupture the line worse. When you have found said leak (general area) get a shovel and start digging till you uncover the area to be fixed. Then depending on your leak shut off the main cut the pipe where leak is then solder a copper sweat sleeve 1" longer than your removed area to the pipe.

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10y ago
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13y ago

By clocking the water meter is the best way to determine a leak

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Q: How do you find a leak in underground copper pipe?
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