The RVB328 is one of the larger fresh water moldings in Ronco's light-duty B-series, a 119 pound blank of translucent natural polyethylene built for rigs and conversions where a standard-size tank runs dry too fast. Builders who spec it are usually solving a specific bay: the technical drawing below is the authority on whether it solves yours, so start there rather than with the headline capacity.
Light-duty in Ronco's language describes the wall schedule, not the seriousness of the tank. The resin is FDA compliant for potable water, the natural translucent finish lets you read the water level through the sidewall, and the molding comes off tooling that Ronco has been running in Tustin, California since 1974. For fresh water service inside a vehicle - supported by the floor of a bay rather than hanging in free air - that wall schedule is exactly what the job calls for.
No fittings are molded in. Ronco spin-welds or threads each port to the locations you specify at order time, which means the fitting layout is a decision you make once, on paper, before the tank exists in your configuration. Print the drawing, mark it, and work the fitting planner on this page until the layout matches your plumbing runs. Remember the loaded weight too: at 8.34 pounds per gallon, a full tank of this size is a structural consideration, not an afterthought.
Cross-shop the rest of the RV water tanks, browse the complete Ronco Plastics line, and get a shipping number from the freight estimator before you decide. OneSource Plastics is an authorized Ronco Plastics dealer.