48 x 20 x 12 inches is a classic underfloor band: long enough to run between frame members, at 20 inches wide it drops between typical crossmember spacing, and 12 inches of height leaves room above the axles. That is the RV9W, Ronco Plastics' 48-gallon fresh water tank - and worth knowing, Ronco's own sheet rates this mold conservatively at 44 gallons, so the shell is not being stretched to make its number.
It is molded in light-duty natural polyethylene, with the translucent wall that lets you read the water level from outside instead of trusting a sender. Brimmed, 48 gallons is about 400 lb of water on a 77 lb tank, so plan the cradle accordingly.
If the proportions are close but not right, the 46-gallon RV22W at 36 x 22 x 14 inches is shorter and taller, and the 46-gallon RV33W at 40.5 x 25.25 x 12 inches keeps the same low height on a wider footprint. More sizes under RV water tanks; shipping questions go to 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:
| Fitting | Size | Location |
|---|---|---|
| Inlet | 1-1/4" female NPT | Top center |
| Outlet | 1/2" female NPT | Bottom center |
| Vent | 1/2" female NPT | Top corner |
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 RV9W 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.
Freight and documents
Ships from: Tustin, CA. LTL freight is quoted to your ZIP with the freight cost estimator or by phone at 866-418-1777. The listed price is before freight.
See this tank
Interactive 3D model with live fill. This tank has an interactive 3D model built to its manufacturer dimensions. Rotate it, and set a fill level to see how much liquid it holds at any height. Open the 3D view on the product photo above. Download the 3D model (GLB).
Product video. Watch the Ronco Plastics RV9W - 48 Gallon Plastic RV Water Tank (48.0" x 20.0" x 12.0") video (59 seconds) with dimensions, fittings and shipping notes.
Ready to order?
Add it to your cart at the top of this page, get LTL freight to your ZIP, or call 866-418-1777. The listed price is before freight.
