Thirty-eight inches long, 8.12 inches tall: the 20W is a plank of a tank. It runs 17 gallons out along a chassis rail or under a bunk in a strip 15.5 inches wide, thin enough to disappear beneath a floor that was never designed to hold a tank at all. Sailboat builders slide this shape under quarter berths; van converters lay it flat between the frame and the plywood.
Ronco molds it as a dual-role Water / Waste Holding Tank: the same shell becomes a fresh-water tank with potable fittings - FDA-compliant polyethylene throughout - or a gray or black holding tank with waste fittings. Nothing is plumbed until you say where; the molding arrives blank and your order tells the shop what it is.
It weighs 12 lb empty and about 142 lb full (water at 8.34 lb per gallon) - a load your fastener plan has to carry through every pothole and every tack. Compare lengths and heights across the RV water tanks category, the RV holding tanks, and the boat tank range - this profile appears in all three worlds.
Made in Tustin, California, where Ronco has rotomolded tanks since 1974. Fittings are installed per order, spin-weld or threaded, at your marked locations: print the drawing below or drop them onto the click-to-place planner. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics 20W 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.
