Ronco Plastics 45H - 25 Gallon Plastic RV Holding Tank (74.0" x 15.0" x 8.25")

Six feet two inches of tank, eight and a quarter inches tall. The 45H spreads its 25 gallons across a 74 x 15 x 8.25 inch envelope, which is the geometry of an underbelly installation: slung low between outriggers, hidden above the coroplast, where vertical space is measured in single digits. Shallow tanks trade drain-down authority for packaging, so outlet placement matters more here than on a deep tank.

That placement is exactly what Ronco lets you control. The plant in Tustin, California, rotomolding since 1974, installs spin-weld or threaded fittings per order at the positions you mark, so put the outlet at the low point of your actual installation, not the theoretical one. Print the drawing further down the page, mark inlet, outlet, and vent along the length, and the tank is built to it.

Service is gray or black water only, no potable use. The blank weighs about 31 pounds, and a full load is roughly 208 pounds, 25 gallons at 8.34 pounds per gallon, distributed across the whole six-foot run, so strap it in more than two places. If your bay is taller and shorter, the 11H packs the same 25 gallons into 37 x 20.25 x 11.5, the 54H does 26 gallons in 28 x 22 x 11.5, and the odd-size 67H covers 24 gallons. More at RV holding tanks. OneSource Plastics is an authorized Ronco Plastics dealer.

Technical drawing: download the Ronco Plastics 45H 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.