Ronco Plastics 20H - 34 Gallon Plastic RV Holding Tank with Side Dump (63.0" x 20.25" x 8.5")

The 20H combines two packaging tricks in one molding: a side dump, with the waste valve exiting the tank's side face, and a long shallow body, 63 x 20.25 x 8.5 inches, that carries 34 gallons under floors with almost no vertical room. Five feet of tank at eight and a half inches tall is underbelly architecture, the kind of shape that hides above the coroplast of a big fifth wheel while the dump bay sits alongside.

Waste duty only: gray or black water, no potable claims. The blank weighs about 33 pounds, and the full-load number is serious, roughly 284 pounds at 8.34 pounds per gallon, stretched across the whole span, so support and strap it at multiple stations along the length. Shallow tanks drain by geometry, which makes outlet placement the critical decision on this molding.

That decision is yours to make: Ronco installs spin-weld or threaded fittings per order at its Tustin, California plant, as it has since 1974. Print the scale drawing below this description, mark where the side dump, inlet, and vent must land for your coach, or place them in the click-to-place planner, and the tank arrives built to the sheet. The smaller side-dump sibling is the 6H at 38 x 27 x 9 inches, the flat giant next door is the 3H at 64 x 32 x 8, and the narrow-deep alternative is the 52H at 46 x 16 x 12.75; the family index is at RV holding tanks. OneSource Plastics is an authorized Ronco Plastics dealer.