Nine gallons in a shoebox: the Ronco Plastics B321 measures 18" x 12.5" x 11", a marine molding compact enough to claim the last odd corner of a console, cuddy or camper cabinet. It is a dual-purpose tank - specified with fresh water fittings it serves as a small potable supply in FDA-grade polyethylene, or specified for holding duty it becomes a tidy gray or black waste tank for a compact head or sink. Thirteen pounds empty, about 75 lb full of water: the mounting demands are modest either way.
The role you choose drives the fitting plan, and Ronco installs each spin-weld or threaded fitting per order at the marks you provide. Small vertical tanks want the outlet at the very base of a side wall and the vent off the top face - easy to get right on paper, annoying to fix after molding. Print the drawing below, mark your ports, and confirm the layout with the on-page fitting planner before you order.
Ronco Plastics has molded small-format marine tanks in Tustin, California since 1974, and the B321 shows how deep that size catalog runs. Neighboring capacities line our boat tanks shelf, with the waste-side range under RV holding tanks. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B321 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.
