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  2. The Sneaky Reason Why Your Dishwasher Isn't Draining - AOL

    www.aol.com/lifestyle/sneaky-reason-why...

    If the dishwasher is not draining, it's usually easy to unclog the dishwasher drain. Learn how to drain a dishwasher with standing water and when to call a pro.

  3. Air gap (plumbing) - Wikipedia

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

    This "air gap" is visible above the sink as a small cylindrical fixture mounted near the faucet. 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 ...

  4. Backflow prevention device - Wikipedia

    en.wikipedia.org/wiki/Backflow_prevention_device

    The simplest, most reliable way to provide backflow prevention is to provide an air gap. An air gap is simply an open vertical space between any device that connects to a plumbing system (like a valve or faucet) and any place where contaminated water can collect or pool. A simple air gap has no moving parts, other than flowing water.

  5. Backflow - Wikipedia

    en.wikipedia.org/wiki/Backflow

    The size of the acceptable gap also depends on the capacity of the incoming supply, such that a stuck-open flow cannot overfill the cistern and close the gap. Air gaps may also protect against back pressure, and are generally favoured for this. [3] However most air gaps also limit the system pressure that may be transmitted across them.

  6. Plug (sanitation) - Wikipedia

    en.wikipedia.org/wiki/Plug_(sanitation)

    A plug in sanitation is an object that is used to close a drainage outlet firmly. The insertion of a plug into a drainage outlet allows the container to be filled with water or other fluids. In contrast to screw on caps, plugs are pushed into the hole and are not put over the hole.

  7. Reduced pressure zone device - Wikipedia

    en.wikipedia.org/wiki/Reduced_pressure_zone_device

    RPZDs are often chosen instead of an air gap since the head loss across the RPZD is much smaller. The device consists of two independent check valves, plumbed in series, with a pressure monitored chamber between (also known as the zone). The chamber is maintained at a pressure that is lower than the water supply pressure, but high enough to be ...