The Ronco Plastics B151 is a 21 gallon marine fresh water tank with a shape of its own in the Ronco catalog - one more answer to the eternal refit question of which molding matches the compartment. Ronco's approach, refined in Tustin, California since 1974, is not one tank in many sizes but many distinct tools, so the drawing below is the first thing to check: if the B151's outline fits your space, everything downstream gets easy.
Everything downstream, in Ronco's system, means fittings installed per order. Spin-welded or threaded ports go exactly where you mark them - fill under your deck fitting, vent at the high corner, supply at the drain-dry low point. Sketch it on the printed drawing, then enter it in the fitting planner on this page so the tank arrives plumbing-ready.
For potable water the polyethylene is FDA compliant, seamless, and corrosion-proof. The tank ships at 83 lb; in service, 21 gallons of water adds about 175 lb, so build the base flat and the straps snug. Alternative footprints in this capacity class are gathered under boat tanks, with the full line at the Ronco Plastics hub and ZIP-level shipping at the freight estimator. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B151 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.
