The B435 is the flagship of Ronco's marine B-series: 280 gallons in a single rotomolded shell. This is houseboat and commercial-vessel territory - water for a crew, not a couple - and it is also the point where tank installation becomes naval architecture. Full, 280 gallons of water weighs roughly 2,335 lb, a load that must be engineered into the vessel's structure and trim, not just set on a shelf.
Even at this size the B-series logic holds: it is a dual-role molding, fresh water or waste holding depending on the fittings, and Ronco installs every fitting per order. On a shell this large, fitting placement across the run of the tank matters enormously - print the drawing below, mark fill, supply or pump-out, vent, and inspection positions where your ship's plumbing actually is, and the shop spin-welds or thread-installs to your marks. The on-page fitting planner covers the options.
The blank ships at 200 lb and moves by motor freight; get your lane priced early with the freight cost estimator. Like every Ronco shell it is molded in Tustin, California, where the company has rotomolded tanks since 1974 - the rest of the large-capacity range is on the Ronco Plastics hub and in the boat tank category. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B435 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.
