The trap arm is the horizontal portion of the drainpipe that connects the trap to the vent stack or the main drainage system. It plays a crucial role in maintaining proper drainage and preventing siphoning, which could otherwise lead to the loss of the water seal in the trap. Trap arms must be installed with a slight downward slope to ensure smooth flow and to comply with plumbing codes. The length of the trap arm is regulated to prevent venting issues, ensuring that the trap retains water and effectively blocks sewer gases.
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