A trap in a sanitary drainage system is a U-shaped or S-shaped fitting designed to hold a certain amount of water, creating a seal that prevents sewer gases from entering the building. Sewer gases contain potentially harmful and unpleasant odors, and some components, like methane, can be explosive. The water held within the trap blocks the passage of these gases, effectively sealing the drain opening. The primary purpose of a trap is to maintain this barrier against sewe....
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