the old grey piping has been the focus of many lawsuits over the years. the problem wasnt the line, it was the fittings. some rv places still stock the fittings. when i get involved with a home that still has this, i remove the existing fittings and use shark connects. a decent plumbing supply house, that supplies to the trade, should have the various fittings you'll need. they don't take any special tools, and can be used on any material. copper, plastic, galvanized, whatever. they are a little pricey but very dependable. they are rated to about two hundred psi. :rollside: