Twenty-five gallons at 38 x 20 x 9 inches: the BOAT71W is a low, broad rectangle sized for the bay under a cockpit sole or the flat beneath a berth cushion. Nine inches of height is short enough to hide almost anywhere, and the 38 x 20 footprint is wide enough that the capacity does not suffer for it - a practical main tank for a trailerable cruiser or a generous second tank on something larger.
Ronco molds it to the H.D. marine spec - the heavy wall, not the light-duty one - in FDA-compliant polyethylene rated for drinking water, at the Tustin, California plant running since 1974. Fittings are installed per order wherever you mark them, spin-welded or threaded. Print the drawing below, place fill, vent, and pickup with the on-page fitting planner, and the tank arrives ready to plumb.
Full, it carries about 208 lb over a wide base - a load any supported shelf handles, held down with a strap. See the rest of the low-profile family in boat tanks, or open the complete line on the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.