The B443 keeps 42 gallons low: a 24 x 24 x 19 inch squat block that puts its center of gravity down where a boat wants it. On sailing vessels especially, a wide-based tank under the cabin sole beats a tall one in a locker - the same water, carried lower, is ballast instead of tenderness.
The shell is dual-role B-series stock: order potable fittings for a fresh water tank, sanitation fittings for a gray/black holding tank. Ronco installs them per order at your marks, spin-welded or threaded, in the Tustin, California shop it has operated since 1974. Print the drawing below, mark your fitting positions - top face for fills and vents, wherever your plumbing dictates for draws - and use the on-page fitting planner to settle sizes.
At 36 lb bare it is easy to place; full it concentrates about 350 lb on its square base, so the sole or shelf beneath should be reinforced. Alternative 40-class shapes live in the boat tank category; browse everything from the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B443 dimensional drawing - print it to plan your install and mark exactly where you want fittings located; Ronco installs spin-weld or threaded fittings to your marked spec.
