One molding, two possible jobs: the Ronco Plastics B279 is a 12-gallon marine and RV tank that leaves the mold as a sealed blank and becomes either a fresh water tank or a gray or black waste holding tank depending on the fittings you order on it. At 23" x 11.5" x 11.5" it is a clean rectangular block that slides under a V-berth step or into an RV storage bay, and a square cross-section means it braces flat against cleats on two sides. Empty it ships at 16 lb; brimful of water it carries about 100 lb, which is the number your mounting shelf actually has to hold.
Because the role is set by the fittings, spend a minute on placement before you order. Ronco installs every fitting to your marks - spin-weld or threaded, inlet, outlet, vent - so print the drawing below, sketch your plumbing run on it, and use the on-page fitting planner to lock in the locations. Specified for fresh water duty, the polyethylene is FDA-grade and safe for drinking water; specified as a holding tank, the same thick wall shrugs off waste chemicals.
Ronco Plastics has been molding tanks in Tustin, California since 1974, and this hull-and-coach dual-purpose line is a big part of why boatyards keep their catalog on hand. Browse the rest of our boat tanks or the full Ronco Plastics range if the footprint is close but not exact. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B279 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.
