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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. Plumbing fixture - Wikipedia

   en.wikipedia.org/wiki/Plumbing_fixture

   The visible water surface in a toilet is the top of the trap's water seal. Each fixture drain, with exceptions, must be vented so that negative air pressure in the drain cannot siphon the trap dry, to prevent positive air pressure in the sewer from forcing gases past the water seal, and to prevent explosive sewer gas buildup.

4. Tap (valve) - Wikipedia

   en.wikipedia.org/wiki/Tap_(valve)

   Taps are normally connected to the water supply by means of a "swivel tap connector", which is attached to the end of the water pipe using a soldered or compression fitting, and has a large nut to screw onto the threaded "tail" of the tap, which hangs down underneath the bath, basin or sink.

5. Sink - Wikipedia

   en.wikipedia.org/wiki/Sink

   A bottom mount sink at the Ernest Hemingway House. Bottom-mount or under-mount sinks are installed below the countertop surface. The edge of the countertop material is exposed at the hole created for the sink (and so must be a carefully finished edge rather than a rough cut). The sink is then clamped to the bottom of the material from below.

6. Trap (plumbing) - Wikipedia

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

   Because it is a localized low-point in the plumbing, sink traps also tend to capture small and heavy objects (such as jewellery or coins) accidentally dropped down the sink. Traps also tend to collect hair, sand, food waste and other debris and limit the size of objects that enter the plumbing system, thereby catching oversized objects. For all ...

7. Pipe-in-pipe system - Wikipedia

   en.wikipedia.org/wiki/Pipe-in-pipe_system

   A water distribution cabinet with a pipe-in-pipe system. Internal pipes can be seen entering the external pipes in the bottom of the cabinet. In case of an internal leak, water will overflow through the external piping and can be detected inside the cabinet.