The Ronco Plastics B466 carries 115 gallons in a 54 x 27 x 20 inch block, which puts it in genuine live-aboard and full-time-RV territory. This is the tank you spec when the rig has a real shower, a real galley, and people who expect both to work far from a spigot.
It is molded as a dual-role B-series shell. Ordered with fresh water fittings, the polyethylene is food-contact grade and suitable for potable storage; ordered with waste fittings, it becomes a high-capacity gray or black holding tank. Either way the body is one seamless rotomolded piece with no chines or joints to fatigue.
Capacity this size makes weight the design driver: at 8.34 lb per gallon, a full B466 holds about 959 lb of water, so the mounting structure matters more than the tank does. Print the dimensioned drawing below, mark inlet, outlet, and vent where your plumbing wants them, and finish the layout in the on-page fitting planner; Ronco installs every fitting per order, spin-welded or threaded.
Built in Tustin, California by Ronco Plastics, molding tanks since 1974, and shipping at 124 lb. Check the freight cost estimator for your ZIP, or see the RV water tank range and full Ronco line for other capacities. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B466 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.
