Fifty gallons that hides in the bilge: the Ronco Plastics B308 spreads its capacity across a 64" x 22" x 9.12" slab, one of the longest low-profile dual-purpose moldings in the B-series. Marine or RV, it installs where only shallow tanks go - under soles, berths and floors - and its role is set entirely by the fittings: fresh water service in FDA-grade polyethylene, or gray or black waste holding in the same seamless shell. Empty it weighs 103 lb; full of water, about 417 lb, carried at the lowest point available.
At this length, fitting placement is the installation. Ronco installs each spin-weld or threaded fitting per order at your marks, so the outlet can sit at the true low end of your installed pitch and the vent at the high end - the difference between a tank that drains dry and one that strands water you cannot reach. Print the drawing below, mark the ports against your actual floor, and settle the layout with the on-page fitting planner.
Ronco Plastics has molded long-format tanks in Tustin, California since 1974. Its shallow siblings line our boat tanks shelf, the waste-side equivalents live under RV holding tanks, and the freight cost estimator will price the trip to your ZIP. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B308 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.
