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  2. Air gap (plumbing) - Wikipedia

    en.wikipedia.org/wiki/Air_gap_(plumbing)

    In the base cabinet under the sink, the drain hose from the dishwasher feeds the "top" of the air gap, and the "bottom" of the air gap is plumbed into the sink drain below the basket, or into a garbage disposal unit. When installed and maintained properly, the air gap works as described above, and prevents drain water from the sink from backing ...

  3. Trap (plumbing) - Wikipedia

    en.wikipedia.org/wiki/Trap_(plumbing)

    Maintaining the water seal is critical to trap operation; traps might dry out, and poor venting can suction or blow water out of the traps. This is usually avoided by venting the drain pipes downstream of the trap; by being vented to the atmosphere outside the building, the drain lines never operate at a pressure much higher or lower than ...

  4. Heat trap - Wikipedia

    en.wikipedia.org/wiki/Heat_trap

    Heat traps are valves or loops of pipe on the cold water inlet and hot water outlet of water heaters. The heat traps allow cold water to flow into the water heater tank, but prevent unwanted natural convection and heated water to flow out of the tank. [1] [2] Newer water heaters have built-in heat traps.

  5. Plumbing fixture - Wikipedia

    en.wikipedia.org/wiki/Plumbing_fixture

    Each fixture usually has a characteristic means of connection. Normal plumbing practice is to install a valve on each water supply line before the fixture, and this is most commonly termed a stop or "service valve". The water supply to some fixtures is cold water only (such as water closets and urinals). Most fixtures also have a hot water supply.

  6. What are leaking underground storage tanks and how are they ...

    www.aol.com/news/leaking-underground-storage...

    Roughly 81 million people live within a quarter-mile of an underground storage tank that's experienced at least one leak, based on the latest EPA data. Most tanks were made of steel in the mid ...

  7. Water heating - Wikipedia

    en.wikipedia.org/wiki/Water_heating

    They typically use low power heating elements, about 1 kW to 1.5 kW, and can provide hot water long enough for hand washing, or, if plumbed into an existing hot water line, until hot water arrives from a remote high capacity water heater. They may be used when retrofitting a building with hot water plumbing is too costly or impractical.

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