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How to Repair a Broken Underground Water Line  
HOW TO 

Tags: Underground Water Line, Water Line Problems, Water Line Repair

A broken water line can be a big costly mess so it is best to take care of it as soon as possible. Here is how to repair a broken underground water line.

1.	Determine where the water line is leaking. It's usually where the water is oozing to the surface.
2.	Insert an air hose inside the line past the point of the break and apply air pressure to empty the line of remaining water.
3.	Find a water line hose one size smaller than the broken water line. Insert it into the larger pipe and push it in, well past where the break is thought to be.
4.	Keep pushing it into the pipe until the far end is submerged in water. You can tell by blowing into the smaller pipe and hearing bubbling.
5.	In the space between the two pipes, inject an expanding urethane foam crack filler. The harder, less expanding type works best.
6.	Hopefully, the urethane ran down to the water level, began to foam back up, sealed the crack, and you will see it oozing back out the top.
7.	Clean up the excess foam, and wait for it to harden.
8.	Connect the inner, smaller water line to the system and apply water pressure again.

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