At 30 x 22 x 14 inches the BOAT7W is the squarest way Ronco molds 35 gallons for marine service - a stout box that trades the specialized footprints of its siblings for plain, useful proportions. If your tank bay is an honest rectangle rather than a leftover sliver, this is the molding that fills it efficiently.
The compact plan form keeps free surface small in both axes, which means less water-slosh momentum than the long tanks carry, and the 19 lb blank is easy to maneuver into place alone. Full, it holds about 292 lb of fresh water in FDA-compliant potable polyethylene behind the thicker heavy-duty marine wall.
Fittings are installed per order at the Tustin, California plant - spin-welded or threaded at the exact marks you provide, Ronco's way since 1974. Print the drawing below, place fill, vent, and pickup to suit your runs, and finalize the layout in the on-page fitting planner.
The rest of the 35 gallon marine shapes are under boat tanks, with light-duty cousins like the 36-gallon RV6W nearby; see it all on the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.