Fifty-two gallons is a serious water budget - at 8.34 lb per gallon the B422 hauls about 434 lb when topped off, enough fresh water to keep a cruising couple off the dock for a real stretch. The shell is built to match the load: the bare blank ships at 129 lb, one of the heavier moldings in the series, with the wall mass concentrated where a full tank works hardest.
As with every marine B-series tank the B422 is a dual-role molding. The same shell is a potable water tank when ordered with drinking-water-appropriate fittings and a gray/black waste holding tank when ordered with sanitation fittings. Ronco installs your set per order - spin-welded or threaded, positioned to your marks. Print the drawing below, plot your fitting locations against your actual hose runs, and use the on-page fitting planner to finalize sizes.
Rotomolded in Tustin, California, where Ronco has been building tanks since 1974. Given the shipping weight, run your ZIP through the freight cost estimator early, and compare the surrounding sizes in the boat tank lineup. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B422 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.
