"It could be dangerous because of other gases that can be present in sewer systems. Traps are there to prevent sewer gases from escaping into the home."įailure to properly vent those stinky gases has the potential to be more than just annoying. "There are misconceptions that the traps are also there to catch objects that might be dropped in the drain, which is not the case. "The role of the P-Trap is to keep the sewer gases out of the home," says Ray Patrick, a master plumber with Roto-Rooter. Under normal conditions, those gases flow right past your bathroom and out through the vent pipe in your roof. That little bit of water is enough to prevent gases from drifting out of the sewage system and into your house. When everything's working as it should, the water stays in the P-trap after you turn off the sink, empty the tub or flush the toilet. The U-shape of the P-trap allows it to collect a small amount of water after each sink use, which acts as a barrier against sewage odors.
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