Ten inches wide. That single dimension is why the BOAT23W exists: it drops 11 gallons of fresh water into the narrow channels other tanks cannot enter - between stringers, along a keel, inside a fin-keel sailboat's bilge run. The full molding measures 30.25 x 10 x 9 inches, a slender bar rather than a box.
Despite the small capacity, this is a heavy-duty molding with the thicker wall Ronco reserves for its H.D. marine series, in FDA-compliant polyethylene rated for potable supply. Tustin, California production since 1974. Fittings are installed per order - spin-welded or threaded at the exact locations you mark - so print the drawing below, set your inlet and pickup with the on-page fitting planner, and the tank arrives ready to plumb.
A narrow tank rewards a low mounting spot: full, this one holds about 92 lb of water, and down between the stringers that mass sits where ballast belongs. Empty it ships at 7 lb. See the rest of the slim shapes in boat tanks, the light-duty equivalents under RV water tanks, or the complete range on the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.