Same 11 gallons as the flat tank in this family, completely different answer: the BOAT16W stacks its capacity into 18 x 13 x 13 inches, a compact block that stands where the shallow version lies down. Choosing between them is a pure geometry call - if your void is a slot, take the flat molding; if it is a cubby, this is the one - and having both shapes in the line is exactly why Ronco's marine range fits boats other tanks do not.
The block format keeps the footprint small: full, its roughly 92 lb of fresh water bears on barely more than a square foot of structure. The blank weighs 10 lb, in Ronco's heavy-duty marine wall, FDA-compliant potable polyethylene throughout.
Fittings go on per order at the Tustin, California plant - spin-welded or threaded to your marks, standard Ronco practice since 1974. Print the drawing below, settle the orientation, place your fittings on what will be the top, and finalize in the on-page fitting planner.
Compare both 11 gallon geometries under boat tanks, see coach-side sizes like the 11-gallon RV23W, and browse it all on the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.