At 55 gallons the B417 sits at the point where water tankage starts changing how you cruise. Figure water at 8.34 lb per gallon and this tank hauls about 459 lb when full - real ballast, and real range between fill-ups for a couple living aboard. The blank itself is one of the heavier shells in the series at 130 lb, molded thick for exactly that loaded service.
The B-series trick applies here too: this one shell is a fresh water tank or a gray/black waste holding tank depending on how it is fitted. Ronco does not pre-plumb anything. You print the drawing below, mark where each fitting should sit, and the factory spin-welds or thread-installs them to your marks before it ships. Work through the on-page fitting planner if you are unsure what your hose runs need.
Every B417 is rotomolded in Tustin, California, where Ronco has built tanks since 1974. A tank this heavy usually ships motor freight, so price the lane with the freight cost estimator before you commit, and compare neighboring capacities in the boat tank category. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B417 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.
