If you sketched a generic RV holding tank from memory, you would draw something very close to the 11H: 37 x 20.25 x 11.5 inches, a proportioned rectangle that fits the classic under-floor waste bay. Within Ronco's six-tank 25 gallon family it is the reference shape, the one to measure against first before considering the specialists, like the long shallow 45H at 74 x 15 x 8.25 or the undimensioned 31H.
It is a gray and black water tank, molded without any potable rating, weighing about 24 pounds as a blank. Do the full-load math before reusing old straps: 25 gallons at 8.34 pounds per gallon is roughly 208 pounds, and waste tanks see that load cycle every trip.
Ronco Plastics rotomolds the 11H in Tustin, California, the same shop that has served RV builders since 1974, and finishes each tank with spin-welded or threaded fittings placed per order. The drawing below this description is printable at scale; mark your inlet, outlet, and vent directly on it, or position them in the fitting planner, and Ronco molds your tank to that layout. The next size up starts with the 54H at 28 x 22 x 11.5, and the whole line is at RV holding tanks. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics 11H 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.
