How to Seal a Hole in a Water Tank

Updated April 17, 2017

A leak in a water tank can affect your entire household, causing low water pressure in faucets and creating the potential for flood damage if the tank bursts open. You can fix a hole in a water tank yourself using a few tools and materials to keep the tank intact. This will save you the cost of hiring a professional plumber to come out and take a look at the leak.

Locate the hole. Turn off the water supply to the tank and drain the tank completely for easier work, as more water may spill out during the drilling process.

Purchase a toggle bolt from a building supply store that is bigger than the hole in the water tank.

Measure the diameter of the toggle bolt and drill a hole over the existing hole that is a little bigger than the size of the toggle bolt you will be using. The hole should now be bigger than it originally was.

Twist a rubber washer onto the toggle bolt, then twist a metal washer over the rubber one. You can find both at most building supply stores.

Collapse the wings and then push the toggle bolt into the drilled hole until it is securely in place. Make sure the washers are on the outside. Refill the water tank with water.

Things You'll Need

  • Electric drill
  • Toggle bolt
  • Metal washer
  • Rubber washer
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