Forty-eight gallons is the point where a boat stops rationing water, and the BOAT22W packs it into a 36 x 22 x 14 inch block with proportions that fit the classic under-berth cavity of a mid-size cruiser. Nothing exotic about the shape - which is precisely its virtue, because a rectangular block is the easiest tank there is to shore up, strap down, and plumb.
The H.D. designation means a heavier wall than Ronco's standard light-duty moldings, sized for the slamming loads a powerboat hull delivers. The resin is FDA-compliant polyethylene rated for potable water. Ronco has molded marine tanks in Tustin, California since 1974, and this one ships as a blank with fittings spin-welded or thread-installed to your marks per order: print the drawing below, lay out your fill, pickup, and vent with the fitting planner on this page, and the tank shows up drilled and welded to your spec.
Respect the load: at 8.34 lb per gallon, a full tank carries about 400 lb, so it wants continuous support under the bottom and a strap over the top, not just chocks at the corners. The empty molding is a manageable 19 lb. Browse alternatives in boat tanks, check delivery on the freight cost estimator, or start from the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.