Seven gallons, 20.5 x 12.75 x 8 inches: the 56W is a footlocker-sized tank for the builds where water is a feature, not the point. A weekend teardrop's sink supply. The rinse tank on a fishing skiff. The gray catch under a camper van's compact galley. It asks for less than a cubic foot and a half of space and gives back a working water system.
Because it is part of the Water / Waste Holding Tank series, that system can be either kind. Fresh-water fittings make it a potable tank - FDA-compliant polyethylene, safe for drinking water. Waste fittings make it a small holding tank that hides completely inside cabinetry.
It weighs 8 lb empty and about 58 lb full (water at 8.34 lb per gallon) - numbers small enough that mounting is a screws-and-straps afternoon, not an engineering exercise. When the build grows, the RV water tanks category scales this same idea through every capacity, RV holding tanks covers the waste side, and the boat tanks range carries the marine versions.
Rotomolded in Tustin, California since 1974. Fittings are installed per order - spin-weld or threaded, where you mark them: print the drawing below or drop them onto the click-to-place fitting planner. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics 56W 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.
