Yes.
Yes it should be
Pic pipe under ground
PVC pipe is fine
The best PVC pipe leak sealant to use for repairing a leak in a PVC pipe is a solvent-based PVC cement specifically designed for PVC pipes.
To repair a PVC pipe, you can use a PVC pipe cutter to remove the damaged section, clean the area, apply PVC primer and cement, then connect a new piece of PVC pipe using a PVC coupling or repair fitting.
Dig it up and replace the leaking section.
I was in the PVC pipe manufacturing business for over 30 years and have never heard of a "1K PVC" pipe. If "1K" means a 1,000 psi pipe, this does not exist as a commercial product. Sorry.
An instrument made of PVC pipe.
A pipe cutter is the best tool to cut PVC pipe.
Yes
You can not glue brass directly to PVC pipe. Use male/female adapters to join these two materials. ie, a male threaded PVC end fitting glued to the PVC pipe and a female threaded brass fitting screwed onto that.
The most effective method for removing a stuck PVC pipe using a PVC pipe extractor is to insert the extractor into the pipe, tighten it securely, and then twist and pull the extractor to gradually loosen and remove the pipe.