Nine inches of height is the whole story of the B346. Its 38 gallons spread across a 37 x 28 inch footprint precisely so the tank can hide under a V-berth, beneath a dinette, or in the underfloor bay of a coach where taller tanks are simply disqualified. Low, wide tanks also behave better when full: about 317 lb of water carried in a shallow layer sloshes less violently and keeps its center of gravity where you want it - down.
The B-series is dual-role, and this shape works hard on both sides of the ledger. As a fresh tank it is FDA-compliant polyethylene, a serious potable reserve for a cruiser or trailer; as a holding tank the same molding swallows gray or black waste for a boat whose bilge geometry demands a flat tank. The fittings you order set the role. Print the drawing below, mark every port with the on-page fitting planner, and Ronco spin-welds or thread-installs them to your spec in Tustin, California - as they have since 1974.
The blank ships at 89 lb, so get a freight number early from the freight cost estimator. Then compare the other low-profile moldings in boat tanks, the underfloor fresh shapes in RV water tanks, or the maker's whole line on the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B346 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.
