Venting a Sewer Line

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When you want to make a plumbing addition to a home it can be difficult to properly vent new drain lines. With walls and other structural fixtures in the way, installing a typical venting pipe can be difficult. But installing an air admittance valve is an easy way to vent a sewer line with little cost or difficulty. By installing an air admittance valve you can ensure water goes down the drain quickly and no smells come out of the sewer lines.

Things You'll Need

  • Tape measure
  • Hacksaw
  • Sanitary tee
  • PVC cement
  • PVC primer
  • PVC coupling
  • Air admittance valve
  • Locate the sewer line you wish to vent. If you do not know which sewer line you wish to vent, you must contact a plumber to properly identify it for you.

  • Measure the size of the sanitary tee with the tape measure. Subtract one inch from the size of the sanitary tee, and this will be the size you must use to cut the sewer line.

  • Cut a piece of the sewer line with the hacksaw to the size of the sanitary tee minus one inch.

  • Apply a PVC primer to the ends of the cut sewer line, the sanitary tee, and the air admittance valve.

  • Apply PVC cement to one end of the sanitary tee and to one end of the cut sewer pipe. Quickly push in the sanitary tee into the sewer pipe and hold it in place for 15 seconds. You must work quickly as PVC cement dries in less than 30 seconds. Apply PVC cement to the other end of the sanitary tee and the other end of the sewer pipe and connect them together by holding them for 15 seconds.

  • Apply the coupling to the remaining opening on the sanitary tee. Apply PVC primer then apply PVC cement to the coupling before securing it to the sanitary tee for 15 seconds.

  • Screw on the air admittance valve to the coupling and the air admittance valve is successfully installed.

Tips & Warnings

  • To buy the appropriate coupling for the air admittance valve, show the salesman the air admittance valve and ask them for the appropriate coupling.

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References

  • Photo Credit Comstock/Comstock/Getty Images
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