Ronco Plastics RV64W - 90 Gallon Light Duty RV Fresh Water Tank (39.25" x 39.25" x 14.5")

Ninety gallons in a slab: the RV64W measures 39.25 x 39.25 inches square and only 14.5 inches tall, which is how Ronco Plastics gets big-rig water capacity under a floor instead of inside a closet. For toy haulers and large fifth wheels with wide belly bays, this 83 lb molding turns dead horizontal space into serious range.

Serious range means serious mass - about 751 lb when full - but the slab geometry is your friend here, spreading the load across the whole square base and keeping the center of gravity low. The build is light-duty natural polyethylene, translucent for through-the-wall level checks, rotomolded in one seamless piece.

In the large-capacity bracket the alternatives run taller and narrower: the 95-gallon RV66W at 67 x 22 x 16 inches is the rail-length version, the 100-gallon RV67W tops the line, and the 83-gallon RV70W sits just below. Range and shipping: RV water tanks and the freight cost estimator.

One Source Plastics is an authorized Ronco Plastics dealer.

Standard fitting package

Choose the standard fitting package in the fittings option at the top of this page and we install these three fittings before the tank ships:

Want to place the fittings yourself? Choose the blank tank: it ships with no fittings at no charge. Add the 90-2218 fitting kit. It includes an access plate with six stainless steel screws, washers and nuts to mount it, a 1-1/2" NPT plug, two 1/2" NPT plugs, two 5/8" thru-hull fittings for supply and vent, and one 1-1/2" thru-hull fitting for fill.

Technical drawing: download the Ronco Plastics RV64W dimensional drawing - print it to plan your install. Choose the standard fitting package (shown in the fitting layout image), or order the tank blank and place your own fittings.