The RVB133 is a 53 gallon fresh water tank from the light-duty page of Ronco's own price sheet - the maker lists it as the B-133 L.D. Light duty is a wall specification, not a verdict: it means the molding is drawn for the life an RV tank actually leads, cradled in a fitted bay and topped up between trips, rather than for the pounding a heavy-wall boat tank is built to absorb. You pay for the water, not for wall you do not need.
It is molded in translucent natural polyethylene, FDA approved for potable water - and the translucence is a working feature, because you can read the water level through the wall with a flashlight instead of trusting a sender. Fittings are not pre-molded: Ronco spin-welds or thread-installs them at the locations you mark, so supply, vent, and fill land where your coach's plumbing actually runs. Print the drawing below, mark it up, and set the layout in the fitting planner on this page.
It ships at 105 lb. Ronco has molded RV tankage at its Tustin, California plant since 1974, and this tank comes off the same tooling philosophy as everything else in the book: one blank, configured per order.
Compare the light-duty fresh range in our RV water tank category - for instance the RV68W, another take on this same capacity - or browse the maker's full line on the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.