Sixty gallons laid out 55 inches long, 20 wide, and 14 tall: the B543 is shaped like a chassis rail run because that is where it usually lives. RV underfloors, the tunnel beside a boat's engine bed, the long dead zone under a gunwale - anywhere the space is measured in feet of length and inches of height, this molding turns it into two months of careful water or a season of holding capacity.
It is a dual-role B-series blank. Fresh water configuration gets FDA-approved potable polyethylene and supply fittings; holding configuration gets the same molding with waste fittings. You choose when you order, and Ronco installs to your marks - spin-welded or threaded. A 55-inch tank gives you real latitude on where the ports land, so use it: print the drawing below, check the run against every crossmember it passes, and commit the layout in the fitting planner on this page.
The tank ships at 102 lb, walls sized for the span, and holds about 500 lb of water. That load wants distributing - bearers across the length, not a strap at each end. Get that right and a long tank is the most trouble-free format there is. Molded in Tustin, California; Ronco has been rotomolding since 1974.
Check delivery on a molding this long with the freight estimator, browse other long formats under RV water tanks, or start from the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B543 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.
