What are the common names given to the following?:

1) The stop valves used under sinks and basins...also used for toilet cisterns.
2) The in-wall brass fitting into which the copper tubing is brazed for the above taps
3) The threaded brass section connecting 1) and 2) if the both have a female thread

What wall thickness is used for 1/2" copper tubing for household mains pressure applications?


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