Ronco molds 22 gallons in more than one blank, and the B348 is one of the two lightweight takes - 28 lb of standard-wall polyethylene shaped for the protected compartments where most water tanks actually live. The capacity suits a daysailer graduating to overnight trips, a small powerboat adding washdown and galley water, or a camper conversion that wants real supply without surrendering payload. Different moldings at the same capacity exist for one reason: so the shape, not the gallons, can match your space.
It arrives bare. You print the drawing below, mark fill, vent, and pickup with the fitting planner on this page, and Ronco spin-welds or thread-installs every port to those marks before the tank ships from Tustin, California - the build-to-order discipline the company has kept since 1974. Specified fresh, the molding is FDA-compliant and potable-safe. Specified for waste, the identical dual-role shell becomes a 22-gallon gray or black holding tank, no other changes required.
Full, it carries about 183 lb - a load that rewards flat bearing and an honest strap even though the empty blank feels like luggage. Compare it against its 22-gallon sibling and the neighboring sizes in the boat tank category, check the road-going shapes in RV water tanks, and see the maker's complete catalog on the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B348 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.
