The Ronco Plastics B311 is a 38-gallon marine fresh water tank in a compact, thick-walled molding - 85 lb of polyethylene shell built for boats that pound. Heavier walls resist oil-canning in a seaway and tolerate the imperfect support of a real-world locker, which is why this molding weighs more than its capacity strictly requires. Full, it holds about 317 lb of water on top of that.
It arrives without fittings because Ronco installs them per order: spin-weld or threaded, at whatever locations your plumbing diagram calls for. That build-to-order step is what turns a catalog molding into your tank - outlet at your low point, fill under your deck plate, vent where it can actually climb. Print the drawing below, mark the ports, and double-check the layout with the on-page fitting planner before you order. FDA-grade polyethylene keeps the water potable from fill to tap.
Molded by Ronco Plastics in Tustin, California - a specialist in nothing but tanks since 1974 - the B311 covers the gap between the 30-gallon and 40-gallon rows of our boat tanks. The complete Ronco Plastics catalog is one click deeper when you want to compare every option. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B311 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.
