Eight inches of height is all the Ronco Plastics B378 asks. This 23 gallon B-series molding spreads its capacity across a 40 x 18 x 8 inch pancake profile, sliding under floors, berths, and dinette seats where a conventional tank simply cannot go. Dual-role as always: potable fittings turn the food-grade shell into a fresh water tank, waste fittings turn it into a low-profile gray or black holding tank.
The molding is stout for its size at 78 lb shipping weight, and a full load of water adds about 192 lb at 8.34 lb per gallon, spread across the wide base rather than stacked vertically.
Shallow tanks live or die by fitting placement, so Ronco installs fittings per order, spin-welded or threaded where you mark them. Print the drawing below, plan your low-profile connections, and run the fitting planner on this page. The company has custom-fitted moldings in Tustin, California since 1974.
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Technical drawing: download the Ronco Plastics B378 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.
