Ninety pounds of shipping weight on a 32-gallon tank is a specification hiding in plain sight. The B331 is one of Ronco's heavy-section marine moldings - nearly three pounds of polyethylene per gallon of capacity - and that thick wall is what you are buying: stiffness against slosh loads, resistance to abrasion where a hull works, and the kind of service life that explains why these tanks outlast the boats around them. Tustin, California has been molding them this way since 1974.
It arrives as a bare blank, without fittings, because the fittings are yours to place. Print the drawing below, mark fill, vent, outlet, and any sender port using the fitting planner on this page, and Ronco spin-welds or thread-installs each one before the tank leaves the plant. For fresh water service the molding is FDA-compliant and potable-safe. And because every B-series shell is dual-role, the identical blank can instead be ordered with waste fittings as a gray or black holding tank - same molding, different job.
Budget for about 267 lb of water when full, on top of the tank's own 90 - this is a tank that earns real bearers, not a shelf. Weigh it against the lighter 32-gallon and neighboring sizes in the boat tank range, get a shipping number from the freight cost estimator, and see everything else the maker molds on the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B331 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.
