Sixty-five gallons is serious capacity for a below-deck molding, and the B324 packs it into 37 x 30 x 15 inches - a wide, squat block that keeps its weight low in the hull instead of stacking it tall. That proportion matters more as tanks get bigger: full of water this one carries about 542 lb, and a 15-inch-tall shape puts that mass where a naval architect would want it, close to the sole.
Like every B-series blank, it leads a double life. Fitted for fresh water it is an FDA-compliant potable molding sized for a family cruiser's supply; fitted as a holding tank the same shell takes gray or black waste. You choose the role when you order, because the fittings decide it: Ronco spin-welds or thread-installs them to the exact locations you mark. Print the drawing below, plot your inlet, outlet, vent, and pickup with the fitting planner on this page, and the tank shows up drilled, welded, and ready for hose.
Ronco has molded marine tanks in Tustin, California since 1974, and the 101 lb shipping weight tells you this is not a thin-walled economy shell. At that weight and size it is worth a minute on the freight cost estimator before checkout. Compare footprints across the marine range in boat tanks, or see everything the maker offers on the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B324 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.
