Eight gallons will not run a household, but on a boat it will run a galley - and the B121 exists for precisely that scale of honesty. It is one of the smallest marine water tanks Ronco molds: a 15 lb blank in FDA-compliant potable polyethylene, sized for the day-sailer, the skiff with a sink, the camper van's auxiliary supply, any install where the question is not how much water but where on earth the tank can go.
Full, it carries about 67 lb at 8.34 lb per gallon - light enough to mount in places larger tanks cannot ethically occupy, high in a locker or outboard of a stringer, though the strap rules still apply. The same blank can be ordered with waste fittings as a micro holding tank; the role is set by the fittings, and it ships plumbed for neither.
Ronco's Tustin, California shop has rotomolded since 1974 and installs every fitting per order: print the drawing below, mark your spin-weld or threaded fitting spots, or click them onto the on-page fitting planner. The rest of the small-tank shelf is in boat tanks, with the full line on the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B121 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.
