Two tanks can share a capacity and share nothing else. The B216 holds 45 gallons, same as other tanks in Ronco's marine line, but in a completely different envelope - and that is the entire reason this SKU exists. Sailboat tankage is a geometry problem first: settee runs, keel voids, and quarter-berth cavities each demand their own outline, so Ronco answers one capacity with multiple moldings. Print the drawing below and hold it against your space; that comparison, not the gallon figure, is what picks the tank.
Whichever 45 gallon shape wins, the engineering is identical: one-piece rotomolded FDA-compliant polyethylene, potable-rated, seamless. This one ships at 109 lb bare. Full, it commits you to about 375 lb of water at 8.34 lb per gallon, so treat placement as ballast planning - low, near centerline, on bearers that carry the whole footprint.
Fittings are installed per order in Tustin, California, where Ronco has rotomolded marine tanks since 1974. Mark the fill, vent, and pickup on the printed drawing - or click them onto the on-page fitting planner - and the shop spin-welds or thread-installs each fitting to your marks. On a long tank, think about where the pickup sits relative to your boat's trim; the low corner on the drawing is not always the low corner afloat.
Compare the other large envelopes in the boat tank category, price the shipment with the freight cost estimator, or start from the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B216 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.
