The 6W is the narrow route to 35 gallons: 48.38 x 14.38 x 13.25 inches - almost exactly four feet long and under fifteen inches wide. Where its 35 gallon siblings go broad or boxy, this one goes slender, tracking a frame rail, the outboard wall of a storage bay, or a keel line while carrying the same week's worth of water as tanks twice its width.
It is molded in the Water / Waste Holding Tank series, which means the slender shell is sold both ways: fresh-water fittings for a potable tank in FDA-compliant polyethylene, waste fittings for a 35 gallon gray or black holding tank threaded into the same tight run.
Twenty pounds empty, about 292 lb full at 8.34 lb per gallon of water, carried along a four-foot line - support the run at several stations and keep the straps at the ends honest. The broad and boxy 35 gallon alternatives are all in the RV water tanks category, the waste library under RV holding tanks, and the marine placements of this same slender logic at boat tanks.
Rotomolded in Tustin, California since 1974. Fittings are installed per order - spin-weld or threaded, to your marks: print the drawing below or click them into place on the fitting planner. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics 6W 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.