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A sewer pipe is normally at neutral air pressure compared to the surrounding atmosphere.When a column of waste water flows through a pipe, it compresses air ahead of it in the system, creating a positive pressure that must be released so it does not push back on the waste stream and downstream traps, slow drainage, and induce potential clogs.
A clear plastic toiletry bag. A toiletry bag (also called a toiletry kit, dopp kit, bathroom bag, ditty bag, sponge bag, toilet bag, personal hygiene kit, amenity kit, travel kit, or washkit) is a portable container—usually a pouch with a drawstring or zippered closure—that holds body hygiene and toiletry supplies such as toothbrush and toothpaste, dental floss, cotton swabs, deodorant ...