Seven gallons, 20.5 x 12.75 x 8 inches, 8 lb out of the box: the BOAT56W is the smallest-capacity tank on this page and one of the most frequently useful. Day boats, small sailers, center consoles, camper vans pressed into boat duty - anything that needs a real potable tank for a washdown pump or a galley tap without dedicating a locker to it.
Do not read small as flimsy: this is an H.D. molding with the same heavy marine wall as Ronco's biggest tanks, in FDA-compliant polyethylene rated for drinking water. Molded in Tustin, California since 1974, and finished per order - fittings spin-welded or thread-installed exactly where you mark them. Print the drawing below, set your two or three connections with the on-page fitting planner, and it ships ready for hose.
Full weight is only about 58 lb, so mounting options are nearly unlimited - a simple shelf and a strap will do. See the rest of the small tanks in boat tanks, the light-duty equivalents under RV water tanks, or the whole catalog on the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.