The B261 is the heaviest molding in this run of Ronco's marine book - 147 lb of polyethylene shipped bare, carrying 105 gallons once plumbed. That empty weight is the specification hiding in plain sight: wall thickness sized for a tank that will spend its life full, offshore, working against a hull that never stops moving.
It comes without fittings because at 105 gallons every installation is bespoke. Print the drawing below, mark fill, vent, pickup, and inspection access exactly where your boat's runs go, and use the on-page fitting planner to spec spin-weld or threaded fittings; Ronco installs each one to your marks before shipping. Fresh-fitted, the food-grade polyethylene is built for potable water, and the B-series dual-role design lets the same blank serve as a very large gray or black holding tank instead.
Budget for about 876 lb full - most of half a ton - sitting low, centered, on a platform tied to primary structure. It travels as freight, so check your lane with the freight cost estimator before scheduling the yard. Molded in Tustin, California since 1974; the rest of the passage-making sizes are in our boat tank category and on the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B261 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.
