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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. Backflow - Wikipedia

   en.wikipedia.org/wiki/Backflow

   Backflow is a term in plumbing for an unwanted flow of water in the reverse direction. [1] It can be a serious health risk for the contamination of potable water supplies with foul water . In the most obvious case, a toilet flush cistern and its water supply must be isolated from the toilet bowl.

5. Here’s why gas could drop below $3 - AOL

   www.aol.com/why-gas-could-drop-below-194433102.html

   Even before Wednesday’s oil sell-off, the national average price for regular gas fell to $3.22 a gallon, according to AAA. That’s a fresh 11-month low and well below the peak in September of ...

6. Gas Prices Are Falling Nationwide, Except in These States - AOL

   www.aol.com/gas-prices-falling-nationwide-except...

   For premium support please call: 800-290-4726 more ways to reach us

7. Drain-waste-vent system - Wikipedia

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

   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.

8. Plumbing fixture - Wikipedia

   en.wikipedia.org/wiki/Plumbing_fixture

   In some occasional cases, a sink may have both a potable (drinkable) and a non-potable water supply. Lavatories and water closets normally connect to the water supply by means of a supply , which is a tube, usually of nominal 3/8 in ( United States ) or 10 or 12 mm diameter ( Europe and Middle East ), which connects the water supply to the ...

9. Sanitary manhole - Wikipedia

   en.wikipedia.org/wiki/Sanitary_manhole

   In a plunging drop manhole, a vertical pipe is used to allow the flow from a higher elevation to drop down directly to the manhole base within that vertical pipe. [26] The vertical pipe of a plunging drop manhole (known as a drop pipe) can be configured in two ways. One way is to have the drop pipe inside the manhole.