A 21 x 21 inch square, 11.25 inches deep, 20 gallons: the B233 is marine tankage at its most rational. No long axis means no wrong orientation - the tank drops into a square locker or a cockpit void either way around, and the drawing below stops being a puzzle and becomes a simple yes or no against your tape measure.
Ronco lists it as a water or waste molding, and that dual identity is settled by the fitting order alone. Plumbed by you for fresh service - fill, vent, pickup - it delivers potable water from FDA-compliant polyethylene; ordered with an inlet and dump instead, the same seamless rotomolded shell holds gray or black water for boats working no-discharge zones. It ships blank either way, never pre-plumbed. Mark the penetrations on the printed drawing or click them onto the on-page fitting planner, and the shop spin-welds or thread-installs each fitting exactly there.
The numbers are friendly: 22 lb empty, about 167 lb full at 8.34 lb per gallon, spread over a 21 x 21 inch base. Solid mounting surface, straps into structure, fittings left reachable - the same quiet install rules Ronco has stood behind from Tustin, California since 1974.
Weigh it against the rectangular 20 gallon shapes in the boat tank category, or see the full spread on the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B233 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.
