The Ronco Plastics B390 holds 5 gallons in a 20 x 12 x 5.5 inch wafer, one of the thinnest moldings in the B-series. It exists for the jobs nothing else fits: under a step, behind a galley kick panel, inside a console. Dual-role like the rest of the family, the food-grade polyethylene shell serves as a small potable water tank or as a single-fixture gray water catch, set by the fittings installed.
It ships at 10 lb and tops out around 42 lb full at 8.34 lb per gallon, so mounting is as simple as tanks get.
Even at this size, fittings are installed per order, spin-welded or threaded where you mark them. Print the drawing below, mark the connection points your space allows, and run the fitting planner on this page. A 5 gallon tank gets the same Tustin, California build-to-order treatment Ronco has offered since 1974.
More compact tanks under RV holding tanks and boat tanks. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B390 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.
