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2. 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.

3. How to Clear a Clogged Sink Drain - AOL

   www.aol.com/clear-clogged-sink-drain-151500237.html

   To avoid a mess, place a newspaper and bucket under the sink trap. Unscrew the slip joints. Take the sink trap to a separate sink or a hose outside to clean all the dirt and grime that has built ...

4. Trap (plumbing) - Wikipedia

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

   Water seal in drain pipe under a sink. Water enters at right, fills the trap, and continues left. Inverted siphoning occurs below the line "A". Examples of traps. In plumbing, a trap is a U-shaped portion of pipe designed to trap liquid or gas to prevent unwanted flow; most notably sewer gases from entering buildings while allowing waste ...

5. Buchan trap - Wikipedia

   en.wikipedia.org/wiki/Buchan_trap

   A Buchan trap (alternative names: Bristol interceptor, [1] interceptor trap and disconnecting trap) is a device fitted in a domestic sewer pipe to prevent odours entering the pipe from the public sewer [2] and permeating the house, a common problem before individual plumbing fittings were separately trapped.

6. FBI reveals New Orleans attacker's online search history - AOL

   www.aol.com/fbi-reveals-orleans-attackers-online...

   The FBI provided an update Tuesday on the New Year's Day attack in New Orleans, revealing new information about the attacker's online search history as well as releasing a photo showing him ...

7. Obesity Rates in the U.S. Drop for the First Time in a Decade ...

   www.aol.com/obesity-rates-u-drop-first-204508332...

   For the first time in a decade, rates of adult obesity in the United States have dropped, a new study has found.. The study followed nearly 17 million people, the majority of whom were in the 26 ...

8. 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.

9. Key US Air Force base closes airspace amid drone sightings - AOL

   www.aol.com/key-us-air-force-closes-070045875.html

   Drone activity caused officials to close airspace over one of the United States’ most critical Air Force bases for almost four hours late Friday and early Saturday, according to a base ...