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How to make a Plumbing loop vent

A plumbing loop vent is a crucial component of any plumbing system. It helps to prevent sewer gases from entering your home and keeps the air pressure in the plumbing system balanced. Here is a step-by-step guide on how to make a plumbing loop vent:

  1. Identify the location for the loop vent: The loop vent should be installed near the plumbing fixtures that are most frequently used, such as sinks, showers, and toilets. This will ensure that the vent prevents sewer gases from entering your home.

  2. Cut a hole in the wall: Use a power drill, and a hole saw to cut a hole in the wall at the chosen location. The hole should be big enough to accommodate the size of the loop vent.

  3. Install the loop vent: The loop vent is a U-shaped pipe with a cap on one end. The open end of the pipe should be inserted into the hole in the wall, and the cap should be on the outside. Use silicone sealant to seal the edges of the pipe to the wall to prevent any leaks.

  4. Connect the vent pipe to the plumbing system: The other end of the loop vent should be connected to the plumbing system using a PVC pipe and fittings. The connection should be airtight to prevent any sewer gases from escaping.

  5. Test the loop vent: Once it is installed, test it by running water through the plumbing fixtures and checking for any sewer gas smells. If there are any smells, adjust the position of the loop vent or add additional vents to improve the airflow.


Making a plumbing loop vent may seem daunting, but with the right tools and some know-how, it can be quickly done. By following these steps, you can ensure that your plumbing system is functioning correctly and that your home is free from sewer gases.

Jeremy Mayhew