I am finishing the basement in our 12-year old home. Before I sheetrock the ceiling, I am replacing all the polybute with copper. There are some 1/2″ runs I can’t get at without ripping out an existing wall or ceiling, so I am leaving the poly. What kind of connectors do I need to use to go from the copper to the poly? All these connections are 1/2″ to 1/2″