Some tank bays are just a cube of leftover air, and the Ronco Plastics B159 is shaped for them: 18 gallons in a compact 20 x 17 x 13 inch block, shipping at just 20 lb. It is part of Ronco's marine water / waste series, so one molding answers two questions - ordered with potable fittings it is a fresh water tank in FDA-compliant polyethylene; ordered with waste fittings it is an 18 gallon gray or black holding tank for a small boat or camper.
The blank shell is finished per order, with fittings spin-welded or threaded where you mark them. On a tank this compact, port placement is half the installation: a vent in the wrong corner or an outlet shy of the low point costs proportionally more when there are only 18 gallons to manage. Print the drawing below, mark it against your space, and run the fitting planner on this page before you order.
Full of water it carries about 150 lb - respectable mass from a 20 lb part, which is the perennial surprise of 8.34 lb per gallon. Ronco has molded these in Tustin, California since 1974. Larger cubes and longer footprints live under boat tanks, the complete catalog at the Ronco Plastics hub, and ZIP-priced shipping at the freight estimator. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B159 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.
