I have my main 1-1/4" supply and return lines coming through my foundation wall and into my pumps. I ran brazed copper for my manes. A friend of mine is having a ground source installed and the installer is running the 1-1/4" in the PE pipe. Does this have to be fusion welded as the underground portion was or can barb and clamps be used for the exposed piping in the basement? I see that the pump has hose running to the unit with hose clamps. Any thoughts?