The old spout began to leak at the swivel. On the new Moen, all wetted parts seem to be brass, tho it does use plastic snap connectors with O-ring seals. Experience says these will be OK, and they make installation easy (well, inasmuch as undersink installations can be easy for anyone but Gumby) This spout swivels a full 360, and if it ever leaks, the fix is an easily accessible O-ring seal at the base of the spout. Hoses are stainless braided. Read the instructions, the T fitting is directional.