Plumbing systems need to breathe in air just like we do

If you don’t install vent pipes at every fixture in a plumbing system, the Venturi effect comes into play. Bad things can happen when you flush toilets, empty a bath or do the laundry. The water that flows through the pipes and flows down can suck the water out of the U-shaped siphons under your sinks, bathtubs, floor drains and showers. When this happens, pests can crawl into your home and sewage gas can enter as well.

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