The Ronco Plastics B320 is a compact 15-gallon block - 17.5" x 16.75" x 13.75" - sized for the under-seat lockers and small bays where most tanks give up. Its nearly square footprint stands stable without elaborate cradling, and at 18 lb empty it is a one-hand install. Full of water it carries about 125 lb, well within the reach of a plywood shelf and two straps.
Like the rest of the marine B-series, it is a dual-purpose molding: fresh water tank or gray or black waste holding tank, decided entirely by the fittings Ronco installs per order. In fresh service the FDA-grade polyethylene keeps the supply potable; in holding service the same seamless shell contains the mess. Every spin-weld or threaded fitting goes in at the location you mark - print the drawing below, sketch your hose runs for the role you have picked, and use the on-page fitting planner to finalize the port map before ordering.
Molded in Tustin, California, where Ronco Plastics has built marine and RV tanks since 1974, the B320 sits in the compact tier of our boat tanks. Its waste-side siblings gather under RV holding tanks, and the whole family lives in the Ronco Plastics catalog. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B320 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.
