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2. Tap (valve) - Wikipedia

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

   Turning a valve knob or lever adjusts flow by varying the aperture of the control device in the valve assembly. The result when opened in any degree is a choked flow . Its rate is independent of the viscosity or temperature of the fluid or gas in the pipe, and depends only weakly on the supply pressure , so that flow rate is stable at a given ...

3. Backflow - Wikipedia

   en.wikipedia.org/wiki/Backflow

   Regulations for these check valves specify the design capabilities of the valve used, according to the hazard. Category 2 contamination may be prevented by a single check valve, but category 3 requires a double check valve (these are manufactured as a convenient single unit, or even integrated into tap (faucet) fittings). Category 5 requires an ...

4. Closet flange - Wikipedia

   en.wikipedia.org/wiki/Closet_flange

   In plumbing, a closet flange (also known as a toilet flange) is a pipe fitting (specifically, a type of flange) that both mounts a toilet to the floor and connects the closet bend to a drain pipe. The name comes from the term "water closet", the traditional name for a toilet. Closet flanges are typically made of brass, cast iron, ABS, PVC, and ...

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6. Trap primer - Wikipedia

   en.wikipedia.org/wiki/Trap_primer

   A trap primer (or trap seal primer) is a plumbing device or valve that adds water to traps.The water seals in traps are needed to prevent sewer gases from entering buildings, but because this water is exposed to the air, it is subject to evaporation over time in infrequently used floor drains, leading to the release of sewer gas into the environment.

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9. Flush toilet - Wikipedia

   en.wikipedia.org/wiki/Flush_toilet

   A flush toilet (also known as a flushing toilet, water closet (WC); see also toilet names) is a toilet that disposes of human waste (i.e., urine and feces) by collecting it in a bowl and then using the force of water to channel it ("flush" it) through a drainpipe to another location for treatment, either nearby or at a communal facility.