The trap seal is the vertical distance of water in a plumbing trap that creates a barrier against sewer gases. It is measured from the dip to the weir of the trap, with a typical depth ranging from 2 to 4 inches, depending on local plumbing codes. A sufficient trap seal is essential for effective odor prevention and overall system hygiene. If the trap seal is too shallow, it can evaporate or be siphoned away, compromising its effectiveness. Maintaining the trap seal involves regular use of fixtures and occasional flushing with water to ensure it remains intact.
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