Ronco Plastics 20H - 34 Gallon Side Dump RV Holding Tank (No Rails) (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.

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. One Source Plastics is an authorized Ronco Plastics dealer.

Fittings

This holding tank ships with its outlet molded in, ready to plumb. Add the Ronco 3-inch uniseal (F3UNISEAL), a loose pipe-to-tank seal you press into the outlet yourself, with no threads or nuts.