How do I solve this air vent problem?

When i flush my toilet it sucks the water out of my shower trap, i live in a trailer and the plummer said it needed vented and would have to rip out walls. I keep a mat over the drain to keep the fumes out.Any suggestions

  3 answers
  • Kelli L. Milligan Kelli L. Milligan on Jan 27, 2019

    I think he's right.

  • Ken Erickson Ken Erickson on Jan 27, 2019

    Normally all waste drains come together somewhere. The drains need a vent to allow air into the system or you get what you have happening. I would be amazed if the mobile home was built without proper vents. Maybe one of the vents near the toilet has become plugged by some critter making a nest. We have a sink in our kitchen that is built into an island. Therefore there is no way to connect the drain line to the house vents. Our plumber added a vacuum breaker under the sink. Air can go in, but gases can't go out.

    • See 2 previous
    • Ken Erickson Ken Erickson on Jan 28, 2019

      Vents need to go up and be higher than drain lines and plumbing fixtures.

  • Ken Erickson Ken Erickson on Jan 27, 2019

    I just saw these vents at Home Depot for less than $20.