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I recall a period of time years ago when many mobile homes were outfitted with "Qwest" piping/tubing that had compression type threaded fittings. Notorious leakers, they were eventually abandoned after the company had to replace piping in many homes. Stuff was gray. Might have been in some underground applications that many years ago, especially in rural areas.

After bleeding the air from the pipes after the job, be sure to close all the faucets inside and out and check to see that the meter is not turning at all, indicating there are no longer any leaks.

Enjoy the job! Sorry I can't be there to help!