Here's a good example of an S trap drain underneath the
kitchen sink. As you can see in the picture above, the drain isn't going
into a vented plumbing waste drain pipe.
In a situation like this, other plumbing fixtures like wash machines and
bathroom usage can suck the water out of the kitchen sink trap, leaving
you with sewer gasses seeping into your kitchen. Let me try to explain
what happens when a kitchen drain, drains into unvented waste pipe.
When ever someone flushes the toilet and the water runs through the rest
of the waste pipes, on its way to the sewer and it passes by the kitchen
waste pipe drain, that connects to the toilet waste pipe drain, it can
create enough pressure to suck all of the water out of the kitchen trap.
That might not have been the best explanation, but all drain pipes need
to drain into a vented waste pipe to eliminate sewer gasses from seeping
into your kitchen.
Home Repair Tip: You need to install a vertical vent pipe that runs all
the way to and through the roof. This might be a difficult job for
anyone who doesn't have enough plumbing experience.
If you want more information and would like to tackle this project on
your own, I suggest that you go down to your local library and check out
the few books or purchase some
plumbing
books online.
If you have a kitchen S drain, there's a good chance that you have them
in your bathroom and through out other parts of your house. If this is
the case, you might need to redo the entire plumbing waste system in
your home.
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