Fifty gallons in a tank that ships at 41 lb - that ratio is the whole story of rotomolded polyethylene. The B198 is one of the largest fresh water moldings in Ronco's marine line, yet two people can pass it down a companionway without drama, and there is no welded seam anywhere on it to open up after a few thousand engine hours of vibration.
The material is FDA-compliant polyethylene rated for potable water, molded in one piece. What you do with the surface is up to you: Ronco ships the tank blank and installs fittings per order, spin-welded or threaded, at whatever locations you mark. On a tank this large that freedom matters - a 50 gallon supply usually feeds a pressure system, a galley foot pump, and sometimes a washdown, and each of those wants its penetration in a different place. Print the drawing below and mark them all, or lay them out on the on-page fitting planner.
Respect the filled weight: about 417 lb of water at 8.34 lb per gallon. That load goes to structure - full-length bearers, straps that pull down into something solid, never just a plywood shelf. Ronco has been rotomolding to this standard in Tustin, California since 1974, and tanks like this one are why cruising boats keep coming back to the catalog.
See how the big moldings compare in the boat tank category, check the lane price with the freight cost estimator, or browse everything on the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B198 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.
