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Yes, a toilet, sink, and shower can share the same vent. This is a common plumbing practice that can simplify installation and save space. When sharing a vent, it's important that the toilet is located downstream from all other fixtures. You will also need to ensure the vent pipe is large enough to handle the demands of all connected fixtures without compromising its effectiveness. Because requirements can vary, you should always check your local building and plumbing codes. Consulting a qualified plumber is recommended to ensure the vent is properly sized, installed, and adheres to all local regulations.

While technically possible, it is unlikely that a clogged toilet will fix itself. Clogs caused by water-soluble materials like toilet paper or human waste may eventually break down in the water, allowing flow to resume. However, this can take time, and any clogs from solid objects require manual removal. In most scenarios, especially if you don't have another bathroom, it is best to fix the clog yourself or call a plumber.

If you notice that your toilet is leaking puddles near the base, the leak is coming from your toilet bowl, and the water could be unsanitary. This is a situation that needs to be dealt with immediately—call a nearby plumbing repair pro right away. A contained leak from tank to bowl is not as urgent a situation, but it could be raising the cost of your water bill—have it looked at as soon as you can.

Some of the problems with in-wall toilets include the complex installation, which might need extra framing. It is also more difficult to access the toilet tank for maintenance or troubleshooting because it’s behind the flush button panel and in the wall. Over time, you’ll spend more on maintenance because you’ll need a plumber to work on hidden plumbing.