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  2. Drain-waste-vent system - Wikipedia

    en.wikipedia.org/wiki/Drain-waste-vent_system

    In the U.S., every plumbing fixture must also be coupled to the system's vent piping. [1] Without a vent, negative pressure can slow the flow of water leaving the system, resulting in clogs, or cause siphonage to empty a trap. The high point of the vent system (the top of its "soil stack") must be open to the exterior at atmospheric pressure.

  3. Sewer gas - Wikipedia

    en.wikipedia.org/wiki/Sewer_gas

    Blocked plumbing vents, typically at the roof, also can cause water seals to fail via siphoning of the water. Exposure to sewer gas also can happen if the gas seeps in via a leaking plumbing drain or vent pipe, or even through cracks in a building’s foundation.

  4. Rain gutter - Wikipedia

    en.wikipedia.org/wiki/Rain_gutter

    Rain gutters can be equipped with gutter screens, micro mesh screens, louvers or solid hoods to allow water from the roof to flow through, while reducing passage of roof debris into the gutter. [21] Clogged gutters can also cause water ingress into the building as the water backs up.

  5. Plumber - Wikipedia

    en.wikipedia.org/wiki/Plumber

    Plumbing work is defined in the Australian Standards (AS3500) Regulations 2013 and refers to any operation, work or process in connection with installation, removal, demolition, replacement, alteration, maintenance or repair to the system of pipes and fixtures that conveys clean water into and liquid waste out of a building.

  6. Chemical drain cleaners - Wikipedia

    en.wikipedia.org/wiki/Chemical_drain_cleaners

    Chemical drain cleaners or openers are pure or mixtures of chemicals used to unclog drains that are blocked by hair, food, or other organic materials. They are often accompanied by other mechanical drain cleaners for the optimal effect.

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  8. Air lock - Wikipedia

    en.wikipedia.org/wiki/Air_lock

    'S' trap inlet to drain [further explanation needed]. The air lock phenomenon can be used in a number of useful ways. An 'S' trap (a pipe that descends from a reservoir, then curves back up, then down again) allows liquid to flow from top to bottom unhindered, and gas cannot flow through the trap unless it has enough extra pressure to overcome the liquid head of the trap.

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