Refit season always finds the water tank last - buried under a berth, shaped like nothing in any catalog. The B108 is one of the shapes Ronco molds for exactly those recesses: an 18-gallon marine water tank shipped as a seamless blank, drilled for nothing until you say where. The molding suits hulls where the tank must conform to the space rather than the other way around.
Material is FDA-compliant polyethylene, potable-rated for fresh systems; the same blank takes waste fittings instead if an 18-gallon holding tank is what the boat needs. It weighs 26 lb empty - a solid wall for the size - and about 150 lb full, water being a relentless 8.34 lb per gallon.
Since 1974, Ronco's Tustin, California shop has installed fittings per order: spin-welded or threaded, at your marks. Print the drawing below, mark the fill, pickup, and vent, or click them onto the on-page fitting planner, and the tank shows up matching your plumbing plan instead of dictating it. Neighboring capacities are in boat tanks; the full range is on the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B108 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.
