Every Ronco holding tank begins life the same way: a seamless rotomolded blank with no holes in it. The 89H is that idea at 53 gallons - a large-capacity waste tank that does not commit to a plumbing layout until you do. You mark where the toilet drops, where the vent rises, where the dump valve exits; Ronco spin-welds or thread-installs the fittings to those marks, and the tank that arrives matches your coach instead of forcing your coach to match the tank.
Fifty-three gallons puts it in serious-traveler territory - roughly 442 lb of waste water when full against a 92 lb empty weight. That empty figure is worth noticing: it is a heavy blank for the class, meaning wall thickness, meaning the tank will forgive the flexing and vibration that underfloor life delivers.
The workflow is simple: print the drawing below, mark your fitting locations on it, or click them onto the on-page fitting planner as you order. Molded in Tustin, California by a shop that has done nothing but rotomolding since 1974. Nearby sizes include the 96H at 44 gallons and the 92H at 48; the full lineup is in the RV holding tank category. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics 89H 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.
