The BOAT1W is 35 gallons of fresh water in the heavy-duty marine wall: 32.12 x 19.5 x 15 inches, a compact near-block of a tank that concentrates real capacity into a short run of hull. Heavy duty here means a thicker shell than the light-duty RV moldings - the wall itself shrugs off the flexing and impact loads a boat installation dishes out.
Full, it carries about 292 lb of water in a footprint barely over two and a half feet long, which makes it a superb low-and-central ballast citizen if you site it well. The blank ships at 19 lb, so dry-fitting solo is no trouble. FDA-compliant potable polyethylene throughout - this is a fresh water tank, full stop.
Ronco installs every fitting per order at its Tustin, California plant, spin-welded or threaded at your marks, the same way since 1974. Print the drawing below, position fill, vent, and pickup for your plumbing, and finalize the order in the on-page fitting planner.
For the thin-wall alternative in this size, see the light-duty 35-gallon RV1W; the full marine set is under boat tanks and everything else on the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.