The B456 spreads 40 gallons across a 37.75 x 22.25 inch footprint while standing just over a foot tall - a low, broad molding that slips under berth flats and dinette seats where a taller 40 gallon block would never fit. Keeping the profile low also keeps the filled weight low in the boat, which is exactly where you want several hundred pounds of liquid to ride.
As a B-series dual-role shell, the B456 is a fresh water tank or a gray/black waste holding tank depending on the fittings you specify - the molding is identical, the plumbing decides. Ronco installs the fittings per order, spin-welded or thread-mounted at the positions you mark. Print the drawing below, mark your fitting locations from the installation rather than from guesswork, and use the on-page fitting planner to confirm sizes.
The blank ships at 88 lb; full, the 40 gallons weighs about 334 lb spread across that broad base, so give it continuous support. Rotomolded in Tustin, California by Ronco, in the tank trade since 1974. Compare the taller and slimmer 40-class shells in the boat tank category or from the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B456 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.
