Nine inches tall and nearly square, the 36W is the pallet-tile of Ronco's line: 16 gallons in a 23 x 21 x 9 inch footprint that covers floor area instead of climbing walls. That geometry belongs under bench seats, in the shallow underfloor trays of vans and truck campers, and beneath cockpit soles - anywhere a builder has square footage but no height to spend.
Its series - Water / Waste Holding Tank - is the tell that this shell leads a double life. With fresh-water fittings it is a potable tank in FDA-compliant polyethylene. With waste fittings the identical molding holds gray water from a shower pan sitting, conveniently, directly above it.
It weighs 13 lb out of the box and about 133 lb full, with water at 8.34 lb per gallon - modest enough that floor mounting over joists or crossmembers is straightforward. Browse thinner and thicker variations in the RV water tanks category, the dedicated waste shapes in RV holding tanks, and the marine applications of the same moldings under boat tanks.
Rotomolded in Tustin, California since 1974. Fittings are installed per order - spin-weld or threaded, at the locations you mark: print the drawing below or set them on the click-to-place fitting planner. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics 36W 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.