Ninety gallons, eleven and a half inches tall. The B204 solves the fundamental problem of big RV fresh water capacity: floors are thin. At 76 x 27 x 11.5 inches it spreads its volume across more than six feet of length instead of demanding depth a chassis does not have, sliding into the underfloor bay between the rails where a squarer 90 gallon tank simply will not go.
That geometry has a payoff beyond fit. Full, this tank holds about 751 lb of water (8.34 lb per gallon), and the long flat footprint spreads that load across the frame instead of concentrating it on one crossmember. Support the whole bottom - full-length bearers, not end brackets - and strap to frame. The tank itself ships at 128 lb, so plan two people and a clear path for the install; the freight cost estimator will price the shipment to your ZIP.
The molding is FDA-compliant polyethylene for potable service, rotomolded seamless in Tustin, California by a shop that has done nothing but tanks since 1974. It ships blank: print the drawing below, mark where the fill, vent, pickup, and any sender should land along those six feet, and Ronco spin-welds or thread-installs each fitting to your marks - or drop the locations on the on-page fitting planner.
See the rest of the big fresh moldings, like the 100 gallon RV67W, in the RV water tank category, or browse the full line on the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B204 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.
