With a PVC locator
A PVC ball valve, and add a threaded coupler to attach the supply line from sink.
No it's PVC sch 80 just heavier grade
Yes
bec. of the gravity.
did you mean pcv? if you did mean pvc, then it depends if you want to use it for water or for waste. and if for water, how many bars of pressure will be in the pipe and for waste is underground or not. unless these questions are answered the answer to this question is vast.
purchase a threaded connector, for the PVC pipe, then purchase a metal threaded adaptor for soft pipe, see your hardware man,
yes any pipe will
PVC piping can be buried as deep as 30 feet. It all depends on what you are doing.
For underground conduit runs, PVC is by far the better of the two conduit systems.
You can purchase a rubber adapter with one side connecting to the PVC pipe and the other connecting to the steel pipe. There are clamps on each end to tighten down and make water tight. Any good plumbing supply or even Home Depot or Lowe's should have them.
water line? half inch or three quarters