First in the catalog, and shaped like a workhorse: the 1W holds 35 gallons in a 32.12 x 19.5 x 15 inch block. These are the proportions of a tank that was never trying to hide - it wants a dedicated bay, a compartment under a dinette bench, or the belly box of a trailer, and in exchange it gives you a genuinely useful week of water in one molding.
Like the whole Water / Waste Holding Tank series it is one shell, two careers. Ordered with fresh fittings it is a potable tank - FDA-compliant polyethylene, safe for drinking water. Ordered with waste fittings it is a 35 gallon holding tank for gray or black service. Empty weight is 19 lb; brimmed it is about 292 lb of water at 8.34 lb per gallon, which decides where it can live long before you do.
The RV water tanks category carries the same capacity stretched long and low if your bay is flat rather than boxy, and RV holding tanks covers dedicated waste shapes. For the whole family in one place, start at the Ronco Plastics hub.
Molded in Tustin, California, as Ronco tanks have been since 1974. Fittings install per order - spin-weld or threaded, located to your spec. Print the drawing below and mark it up, or use the click-to-place fitting planner. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics 1W 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.
