The B451 is the heavier of Ronco's two 19 gallon marine shells, shipping at 82 lb bare - a wall-thickness statement aimed at workboats, rental fleets, and charter boats where the tank gets used hard by people who did not buy it. Commercial duty is mostly about surviving neglect, and mass in the molding is how a plastic tank does that.
The dual-role B-series formula holds: potable fittings make it a 19 gallon fresh water tank, sanitation fittings make it a gray/black holding tank, and the shell is identical either way. Ronco installs your fittings per order - spin-welded or thread-mounted, at your marks. Print the drawing below, mark it from the boat rather than from memory, and use the on-page fitting planner to lock sizes.
Full, it holds about 158 lb of water. Rotomolded in Tustin, California, where Ronco has built tanks since 1974. If your installation is protected and weight matters more than armor, the lighter 19 gallon shell and the rest of the small range are in the boat tank category, all indexed from the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B451 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.
