An island sink presents a unique plumbing problem: Like all drains, the sink drain has to be vented to allow air ... kitchen. Plumbers have two solutions. One allows them to run a vent pipe under ...

An alternate escape route keeps air moving and the drain line flowing at full capacity. You may have noticed that your bathtub has an overflow vent hole, too, but not your kitchen sink.

My new kitchen ... vent pipes is to allow air into your plumbing system. When your plumbing drain system is not in use, all the pipes are filled with air except for the water that’s in the traps ...

Thus, you might think the plumbing vent ... of air above the water that’s traveling down the pipe on its way to the sewer or septic tank. The short horizontal pipe draining your kitchen sink ...