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2. Drain-waste-vent system - Wikipedia

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

   In the U.S., every plumbing fixture must also be coupled to the system's vent piping. [1] Without a vent, negative pressure can slow the flow of water leaving the system, resulting in clogs, or cause siphonage to empty a trap. The high point of the vent system (the top of its "soil stack") must be open to the exterior at atmospheric pressure.

3. Nipple wrench (plumbing) - Wikipedia

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

   In plumbing, a nipple wrench is often known as an inside pipe wrench. [1]An eccentric toothed gear is mounted on a hexagonal shaft. The wrench is introduced inside the pipe (especially a close nipple, which has threading its entire length, and therefore no surface for an outside wrench).

4. Nipple (plumbing) - Wikipedia

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

   A close nipple can only be unscrewed by gripping one threaded end with a pipe wrench which will damage the threads and necessitate replacing the nipple, or by using a specialty tool known as a nipple wrench (or known as an internal pipe wrench) which grips the inside of the pipe, leaving the threads undamaged. When the ends are of two different ...

5. Piping and plumbing fitting - Wikipedia

   en.wikipedia.org/wiki/Piping_and_plumbing_fitting

   A common type of this style fitting is a "hex bushing" with a hex head for installation with a pipe wrench. A double-tapped bushing is more compact than a reducer but not as flexible. While a double-tapped bushing has a more minor female thread concentric to a larger male thread (and thus couples a smaller male end to a larger female), a ...

6. Pipe wrench - Wikipedia

   en.wikipedia.org/wiki/Pipe_wrench

   A pipe wrench is any of several types of wrench that are designed to turn threaded pipe and pipe fittings for assembly (tightening) or disassembly (loosening). The Stillson wrench, or Stillson-pattern wrench, is the usual form of pipe wrench, especially in the US. The Stillson name is that of the original patent holder, who licensed the design ...

7. Flight Attendant Hospitalized After Falling from Plane ... - AOL

   www.aol.com/lifestyle/flight-attendant...

   A flight attendant has reportedly been injured after falling from a plane at an airport in England. On Monday, Dec. 16, at approximately 4:30 p.m. local time, the woman — who works for the ...