A perfect 34 x 34 inch square, 13 inches tall: the BOAT44W is the 58-gallon tank for boats whose spare volume is square rather than long - beneath a V-berth insert, in a deck box, centered over the keel where a symmetric footprint keeps the boat in trim. Square tanks are also the simplest to chock, because every side is a bearing surface.
It carries the H.D. marine wall that separates this series from Ronco's light-duty moldings, in FDA-compliant polyethylene rated for potable water. Molded in Tustin, California, where Ronco has rotomolded since 1974. The tank ships at 25 lb as a blank, with fittings spin-welded or thread-installed per order at the points you mark - print the drawing below and place them with the on-page fitting planner.
Full, it holds about 484 lb of water over that square base, so build the platform under it accordingly. Compare the long-format 58-gallon alternatives in boat tanks, check shipment cost on the freight cost estimator, or browse the maker's catalog at the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.