Some hulls only give you a slot, not a bay. The Ronco Plastics B369 is built for that slot: 18 gallons in a 47.5 x 11.38 x 8.5 inch chase, barely wider than a bilge stringer. It is a B-series dual-role molding, so the same shell works as a potable fresh water tank in food-grade polyethylene or as a gray or black waste holding tank, decided purely by which fittings you have installed.
At 8.34 lb per gallon a full load is about 150 lb, kept low and centered where a narrow tank belongs. The molding itself ships at 75 lb, a thick-walled piece for its size.
There are no stock fitting positions to fight. Print the drawing below, mark your inlet, vent, and pickup, and the factory spin-welds or threads each fitting to your marks; the fitting planner on this page walks you through the choices. That per-order approach has been standard practice at Ronco's Tustin, California shop since 1974.
Compare more boat tanks or shop the whole Ronco Plastics line. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B369 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.
