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2. 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.

3. 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.

4. Diaphragm valve - Wikipedia

   en.wikipedia.org/wiki/Diaphragm_valve

   In addition to the well known, two way shut off or throttling diaphragm valve, other types include: Three way zero deadleg valve, sterile access port, block and bleed, valbow and tank bottom valve. Valve body

5. Sanitary manhole - Wikipedia

   en.wikipedia.org/wiki/Sanitary_manhole

   The soils cannot drain pore water fast enough in a repeated compression causing the pore water pressure to be accumulated to a high pressure. This causes the soils to lose their stress and become muddy. Any objects with apparent weights of less than of those of the ground's muddy water will float up. Manholes, which are sealed hollowed objects ...

6. Globe valve - Wikipedia

   en.wikipedia.org/wiki/Globe_valve

   Internal parts of a typical globe valve. The body is the main pressure-containing structure of the valve and the most easily identified as it forms the mass of the valve.It contains all of the valve's internal parts that will come in contact with the substance being controlled by the valve.

7. Ballcock - Wikipedia

   en.wikipedia.org/wiki/Ballcock

   Toward the end of the discharge process, the ballcock responds to the drop in water level and refills the tank. Should the float or valve fail and allow the water level to exceed the fill line, the water will pour into the overflow tube and out to the bowl (in the flapper valve type) or to an outside drain (in the siphon type).