Ronco Plastics 24H - 20 Gallon End Dump RV Holding Tank (No Rails) (40.5" x 30.0" x 5.0")

Five inches. That is the whole height of the 24H, and it is the reason this tank exists. Underfloor bays, basement compartments, and the gap between chassis rails on a lot of coaches will not take a conventional holding tank, so Ronco molds this one as a wide flat pan: 40.5 x 30 inches of footprint spread so thin that 20 gallons of capacity hides where a toolbox would not fit. Full of gray water it carries about 167 pounds, spread across that whole pan, which is exactly how you want weight distributed under a floor.

The trade the pan shape makes is honest: you need the horizontal real estate, and you need drainage designed around a shallow sump. Ronco has been solving that since 1974 at their Tustin, California plant, and the drawing for this molding shows a drainage slope built into the pan so it actually empties instead of holding a permanent half inch of waste. Compare the deeper, smaller-footprint shapes like the 59H or the long narrow 44H at 80.75 x 14 inches if your space runs the other direction; the holding tank category sorts the whole family.

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.

Technical drawing: download the Ronco Plastics 24H dimensional drawing - print it to plan your install. The outlet is molded in. Add the Ronco 3-inch uniseal to connect it.