Does anyone know anything about this type of plumbing? Any problems with it? It appears to be stainless steel with copper or brass fittings, and is installed throughout a 1970 built house on both supply and drains. It was in good shape overall, but some surface corrosion or stains at some of the seams. I've never seen it before. Only thing I could find online was a reference to one lawsuit against the manufacturer for undisclosed reasons.