Thirty-five gallons is the step-up size - the capacity owners land on after a season of running dry at 20. The B203 is Ronco's marine fresh water molding at that figure: enough supply to add real days at anchor, in a shell that still fits the kind of under-berth and settee cavities where sailboat tankage actually lives. Hold the drawing below against your compartment before you order; in a hull, the outline decides everything.
Construction is the Ronco standard: one-piece rotomolded FDA-compliant polyethylene, potable-rated, no seams to fatigue where the hull flexes. Fittings are not molded in - they are installed per order, spin-welded or threaded, at the exact points you mark. Print the drawing and pencil in the fill, vent, and pickup, or place them with the on-page fitting planner, and the tank arrives matched to your plumbing instead of fighting it.
Plan the structure for the full load: about 292 lb of water at 8.34 lb per gallon, on top of a tank that ships at 91 lb. Bearers under the whole footprint, straps to structure, pickup at the installed low point. Ronco has been guiding installations like this from Tustin, California since 1974.
Size up or down in the boat tank category, or scan the entire range on the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B203 dimensional drawing - print it to plan your install and mark exactly where you want fittings located; Ronco installs spin-weld or threaded fittings to your marked spec.
