Fifty-two gallons splits the difference between weekend tankage and passage tankage, and the B333 delivers it in a heavy-section molding - 100 lb of polyethylene before a drop of water goes in. Tanks in this weight class are what Ronco builds for boats that work: charter vessels topping off between every trip, liveaboards cycling the tank daily, workboats where the water system is not allowed to be the weak point. The thick wall is quiet insurance you only appreciate years later.
Like Ronco's other bare marine blanks it ships without fittings so the ports land where your plumbing wants them. Print the drawing below, plot fill, vent, outlet, and sender with the fitting planner on this page, and every fitting is spin-welded or thread-installed to your marks before the tank leaves Tustin, California - a plant that has molded marine tanks since 1974. Specified for fresh water, the shell is FDA-compliant and potable-safe; specified for waste, the same dual-role molding becomes a serious gray or black holding tank.
Two logistics numbers before you order: the blank ships at 100 lb, and the filled tank carries about 434 lb of water, so plan both the delivery and the bearers. The freight cost estimator answers the first question by ZIP. For the size question, work through boat tanks or the full catalog on the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B333 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.
