How to Pressure Test Air and Water Lines


Pressure testing water lines and air lines is the most secure way of knowing whether a leak is present. Many times relying on only a visual inspection for leaks will give you a false sense of security. Fortunately, a pressure test will ensure that the water lines and the gas lines have no leaks and can maintain air pressure for at least two hours. While it can seem intimidating to use pressure testing on water and air lines, it is actually pretty simple and can be done in little time.

Things You'll Need

  • Pressure tester gauge
  • Pressure tester plugs
  • Air compressor
  • Inspect all the faucets and make sure they are closed. Check all the bathrooms, the kitchen, laundry room, and the outside of the home for open faucets.

  • Connect the air pressure plug to a faucet outside the home. The most common faucet to use is the garden hose faucet. Tighten the air pressure plug with your hands. If you are testing an air line, connect the pressure plug a valve on the air line.

  • Connect the pressure tester gauge to the pressure plug. Tighten the gauge to the pressure plug with your hand.

  • Connect the air compressor to the pressure gauge. Set the air compressor to 20 PSI.

  • Turn on the air compressor and fill the pipes with air until the pressure gauge reads 100 PSI. Check again two hours later to make sure that the pressure was maintained at 100 PSI. If the pressure dropped, then the system has a leak. If you cannot get the gauge to go up in pressure then the system also has a leak.

Tips & Warnings

  • You can rent the plugs and the pressure gauge at most tool rental locations.

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  • Photo Credit Comstock/Comstock/Getty Images
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