The Ronco Plastics B401 stacks 70 gallons into a compact 34 x 30 x 18 inch block, the deep-format alternative to Ronco's long, flat underfloor tanks. When your rig has a locker or bay with height to spare, this shape gives you big capacity on a small footprint. It is a B-series dual-role molding: potable fittings finish it as a food-grade fresh water tank, waste fittings finish it as a holding tank.
Seventy gallons of water weighs about 584 lb at 8.34 lb per gallon, concentrated on roughly a square of floor, so put it over frame members. The molding itself ships at a manageable 52 lb.
Print the drawing below and mark your fittings where the compartment allows; the factory installs them per order, spin-welded or threaded to those marks, with the fitting planner on this page capturing the spec. Ronco has molded made-to-order tanks in Tustin, California since 1974.
Compare RV fresh water tanks, boat tanks, and the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B401 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.
