J.M. Martinac Shipbuilding Corp. in Tacoma, WA uses Blücher stainless-steel pipe for black and graywater systems on its vessels. Photos by Will Austin and Don Wilson. See full article via Plumbing & Mechanical Engineer, May 31, 2013 @ https://www.pmengineer.com/articles/90758-seattle-finds-savings-with-stainless-steel-retrofits