Forty-three gallons is where a water system stops being a convenience and starts being an itinerary: a family weekend off-grid, a work crew's wash water for the week, a liveaboard's real fresh supply. The 22W carries it in a 36 x 22 x 14 inch rectangle - deep enough to be efficient, low enough to fit a storage bay, with no wasted corners.
It belongs to Ronco's Water / Waste Holding Tank series, so the molding is appointed at order time: fresh-water fittings make it a potable tank in FDA-compliant polyethylene; waste fittings turn the identical shell into a high-capacity gray or black tank. Builders often buy the same molding twice - one of each - and get matched footprints on both sides of the system.
Respect the fill math. The blank is 19 lb; full it is about 359 lb of water at 8.34 lb per gallon, so it mounts over structure, ideally low and near the axles. Neighboring capacities in both directions live in the RV water tanks category and RV holding tanks; parcel shipping on the empty tank prices out in the freight estimator.
Molded in Tustin, California by the shop Ronco has run since 1974. One Source Plastics is an authorized Ronco Plastics dealer.
Fitting packages
This tank works for fresh water or waste holding. Choose a fitting package ($30) and we install it before the tank ships, or order it blank:
| Package | Inlet | Outlet | Vent |
|---|---|---|---|
| Water | 1-1/2" female NPT, top center | 1/2" female NPT, bottom center | 1/2" female NPT, top corner |
| Holding | 1-1/2" female NPT, top center | 1-1/2" female NPT, bottom center | 1/2" female NPT, top corner |
Placing your own fittings? Add the Todd 90-2218 water kit or the 90-2219 holding kit.
Technical drawing: download the Ronco Plastics 22W dimensional drawing - print it to plan your install. Choose the water or holding fitting package (shown in the fitting layout images), or order the tank blank.
