Note the empty weight first: 75 lb. For a 58 gallon tank measuring 46.75 x 20.75 x 15.5 inches, that number means one thing - wall. The 42W is molded thick, the way Ronco builds tanks that will spend years full, vibrating down a highway or pounding through chop. Capacity gets the headline; the resin is the reason it lasts.
It is a Water / Waste Holding Tank series shell, so 58 gallons is whatever your system needs it to be. Fresh-water fittings make it a potable tank in FDA-compliant polyethylene - a genuine boondocking or liveaboard supply. Waste fittings make it one of the largest holding tanks in the line, the kind that turns dump planning from weekly to occasional.
Full, it carries about 484 lb of water at 8.34 lb per gallon - a quarter-ton system that belongs bolted over frame, low in the vehicle or hull. The same footprint is also offered as the light-duty potable RV42W when the duty cycle is gentler; the broader spread of large shapes lives in the RV water tanks category and RV holding tanks.
Rotomolded in Tustin, California since 1974. Fittings are installed per order - spin-weld or threaded, at your marked locations: print the drawing below or lay them out on the click-to-place planner. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics 42W 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.
