A 100 gallon molding moves you into a different class of boat: trawlers, houseboats, crew boats, anything where fresh water is measured in days of autonomy rather than weekends. The B426 delivers that capacity in a shell that ships at 119 lb bare - stout, but still a weight two people can maneuver into a lazarette or engine-room corner before it gets plumbed.
Like the rest of Ronco's marine B-series, it is a dual-role molding: the same 100 gallon shell becomes a potable water tank or a gray/black waste holding tank purely on the strength of which fittings you order. Print the drawing below, mark your inlet, outlet, vent, and any gauge positions, and Ronco spin-welds or thread-installs each one to your marks in the Tustin, California shop it has run since 1974. The on-page fitting planner is the fastest way to settle what goes where.
Respect the full weight: 100 gallons of water is about 834 lb, and that load belongs on structure tied to the hull, not a plywood shelf. A tank this size typically ships motor freight - check your lane with the freight cost estimator - and the rest of the big-capacity family is on the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B426 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.
