The 26W is what balance looks like in polyethylene: 31 gallons in a 31 x 23 x 11.5 inch slab - not the longest, not the flattest, just proportioned so that one tank handles the water for a mid-size coach or a weekending cruiser without dominating a single compartment. Its almost-square footprint sits happily on a bay floor with room left for the pump and plumbing beside it.
Dual-role, per Ronco's Water / Waste Holding Tank series: fresh fittings make it a potable tank in FDA-compliant polyethylene, waste fittings make it a 31 gallon gray or black holding tank. One drawing, two systems - which is why builders spec this molding on both sides of the same floor plan.
The blank weighs 16 lb; the full tank carries about 259 lb of water at 8.34 lb per gallon. Mount accordingly. If the numbers are close but not right, the RV water tanks category brackets this capacity in flatter and deeper shapes, RV holding tanks covers the waste library, and the Ronco hub shows everything at once.
Rotomolded in Tustin, California - the same plant since 1974. Fittings are installed per order, spin-weld or threaded, to your layout: print the drawing below and mark it, or use the click-to-place fitting planner. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics 26W 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.
