The B271 is 7 gallons in a 19.25 x 13.12 x 7.12 inch flat pack - low enough to disappear under a bunk or bench, big enough to run a small galley or head for a day. Seven gallons is the capacity where a build's water system starts to feel real, and this shape is the least intrusive way to carry it.
Dual-role, per the B-series design: fresh-fitted, the food-grade polyethylene molding is potable supply; waste-fitted, it is a low-profile gray or black catch for a compact fixture. It arrives blank. Print the drawing below, mark the fitting locations, and the on-page fitting planner specs the spin-weld or threaded fittings Ronco installs per order in Tustin, California, where they have molded tanks since 1974.
Eleven pounds empty and about 58 lb full - install is one person, one strap, a flat bed under the whole base. When the build outgrows it, the next sizes are in our boat tank category and RV water tanks; everything Ronco molds is on the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B271 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.
