English: A representation of an average drain trap. The water settles at the bottom of the U-bend and is help in place with gravity, thus preventing the ingress of sewer gases back up along the drain.
{{Information |Description ={{en|1=A representation of an average drain trap. The water settles at the bottom of the U-bend and is help in place with gravity, thus preventing the ingress of sewer gases back up along the drain...