Thirty gallons in a run of 39 x 15 x 12.5 inches is a shape boats actually have room for: the long, shallow void under a settee or along a hull stringer where nothing rectangular and tall will ever fit. The Ronco Plastics B140 is molded exactly for that kind of space, and because it belongs to Ronco's marine water / waste series, the same molding can serve either job. Ordered for fresh water, it is a potable tank in FDA-compliant polyethylene; ordered for gray or black service, it becomes a 30 gallon holding tank. The role is set by the fittings you specify, not by the shell.
That is the part worth slowing down for. The B140 arrives with fittings installed to your order - spin-welded or threaded, placed where you mark them - so the inlet, vent, and pickup land where your plumbing already runs instead of where a mass-market tank decided they should. Print the dimensioned drawing below, sketch your locations on it, and use the fitting planner on this page to spell out sizes and positions before you buy.
Plan mounting around the working number, not the shipping one: the tank ships at 80 lb, but water is 8.34 lb per gallon, so a full B140 is roughly 250 lb of live load. Give it a flat platform and restraint that assumes the boat will pound. Ronco has been molding tanks in Tustin, California since 1974, and this hull-friendly footprint is the kind of thing that experience produces.
See the rest of the line at boat tanks and the full Ronco Plastics range, or price shipping to your ZIP with the freight estimator. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B140 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.
