At 4.75 inches tall, the B323 is closer to a molded panel than to what most people picture when they hear the word tank. Ronco spreads its 10 gallons across a 32 x 19.5 inch footprint so the whole molding slides under a berth, beneath a cockpit sole, or into the shallow void under an RV floor where nothing else fits. If your problem is vertical space - and on most boats it is - this is the shape that solves it.
The B-series is a dual-role molding: the same blank becomes a fresh water tank or a gray or black waste holding tank depending on the fittings we install. Ordered for fresh water duty, it is molded from FDA-compliant polyethylene and safe for potable supply; ordered as a holding tank, the identical shell handles waste. Ronco has been rotomolding these in Tustin, California since 1974, and the tank ships as a blank at 21 lb with fittings spin-welded or thread-installed to your marks per order. Print the drawing below, mark your fitting locations with the on-page planner, and it arrives ready to plumb into your system.
One number to respect before you commit: full of water this tank carries about 83 lb. A shallow pancake like this spreads that load well, but it still wants continuous support under the bottom, not just blocking at the corners. Browse the rest of the shallow shapes in our boat tank category, see the fresh-side options under RV water tanks, or start from the full line on the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B323 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.
