The B545 holds 53 gallons in 30 x 22 x 20.5 inches - a dense, deep-bodied molding that gets serious capacity out of a compartment barely 30 inches on its longest side. Among the mid-size B-series tanks it is the volume-per-footprint pick: where the shallow tanks spread out, this one digs down.
It is molded as a dual-role blank like the rest of Ronco's marine line. With supply fittings it runs as a fresh water tank in FDA-approved potable polyethylene; with waste fittings the same molding becomes a big holding tank in a small hole. Fittings are installed per order, spin-welded or threaded to the locations you mark. The 20.5-inch depth means top-mounted senders and pickups have real column to work with - print the drawing below, mark the ports, and finish the layout in the on-page fitting planner.
Fifty-three gallons is about 442 lb of water on top of the tank's 42 lb shipping weight, concentrated on a compact base - so this one, more than the shallow tanks, wants genuine structure underneath rather than a suspended shelf. Molded in Tustin, California, where Ronco has run its shop since 1974.
Deep-bodied alternatives are in the boat tank category, holding-duty formats under RV holding tanks, and the full catalog on the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B545 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.
