In most cases the vent pipe exits through the roof.
Snake vent pipe roof.
They regulate the air pressure in your system allowing waste to flow freely.
Then try the following.
To continue feed the end of a garden hose down the vent and have someone on the ground turn on the water.
For those items you can t remove from above run the plumber s snake down the vent pipe.
Look for a narrow plastic or metal pipe protruding from the roof roughly above the sink or toilet with the drainage problem.
Look for a black pipe that is about three inches in diameter made of cast iron or pvc.
If possible shine a flashlight down the pipe to look for the blockage.
Sometimes it might be in your yard.
But your vent will plug up again real soon because a drain cleaner can t do a good job of removing all the gunk that s gathered at the t junction of your vent and your pipe from your drain toilet.
Feed the end of a garden hose down the vent pipe and have someone on the ground turn on the water.
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If they become blocked your system won t drain properly.
Use a flashlight to shine a bright light down the vent pipe to look for further blockage you can reach.
You ll usually find a vent pipe on your roof.
The culprit could be a wasp s or bird s nest or even the carcass of a small animal like a squirrel or rat that fell into the pipe and became trapped.
You will need a ladder to access the roof.
Here s a closer look at this issue.
To do it yourself start by clearing debris from around the pipe.
Remove any items you can reach.
Sewer vent pipe location.
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If you can see but can t reach run a plumber s snake down the vent pipe.