Somewhere there is a fifth wheel sitting dead in a storage yard because its 33 gallon gray tank split and the manufacturer went under in the last downturn. The 79H is the kind of molding that revives it. Ronco has been rotomolding RV tanks continuously since 1974, which means shapes that OEMs specified decades ago are still coming off the same Tustin, California floor, fittings installed fresh to whatever the coach's plumbing requires.
The tank is a 33 gallon gray or black water molding, about 29 pounds empty, no potable rating, with a full-load weight around 275 pounds at 8.34 pounds per gallon. Identification is by measurement: check your cavity against this tank's drawing, then against the 52H at 46 x 16 x 12.75 inches, the 15H, and the heavy-wall 68H, the other three shapes in the size.
Once the shape is right, the fittings are yours to place: spin-welded or threaded, installed per order. Print the scale drawing from the block below, transfer the old tank's inlet, outlet, and vent positions onto it, or click them into the fitting planner, and Ronco builds your tank to that sheet. The complete range is under RV holding tanks. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics 79H 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.
Freight
LTL freight is quoted to your ZIP with the freight cost estimator or by phone at 866-418-1777. The listed price is before freight.
See this tank
Interactive 3D model with live fill. This tank has an interactive 3D model built to its manufacturer dimensions. Rotate it, and set a fill level to see how much liquid it holds at any height. Open the 3D view on the product photo above. Download the 3D model (GLB).
Ready to order?
Add it to your cart at the top of this page, get LTL freight to your ZIP, request a written quote, or call 866-418-1777. The listed price is before freight.
