A perfect cube: 12 x 12 x 12 inches, 7 gallons. The B326 is the simplest shape in the B-series and one of the most useful, because a one-foot cube is the easiest volume to find on any boat or camper - behind a helm seat, in the corner of a cockpit locker, under a van bench. At 10 lb empty it is also light enough to dry-fit one-handed while you figure out exactly where it lives.
Dual-role, like every tank in this family. Specify fresh water and the cube is molded in FDA-compliant polyethylene for potable duty - a day tank, a dedicated drinking supply, a washdown reservoir. Specify waste and the same molding becomes a compact gray water catch for a small galley or a wet locker sump. The fittings you order determine the job: Ronco spin-welds or thread-installs them wherever you mark, and the on-page fitting planner plus the printable drawing below make the marking part painless.
Full, it holds about 58 lb of water - enough that you still want it strapped and sitting on structure, not shelving. Ronco has molded these in Tustin, California since 1974, and small blanks like this ship fast by parcel. See the rest of the small-tank shapes in boat tanks, the camper-sized fresh options in RV water tanks, or the complete line on the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B326 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.
