A 22 x 22 inch footprint makes the 56H the square peg of Ronco's holding tank line, and sometimes a square hole is exactly what you have. Twelve inches deep, 21 gallons, with the dump outlet positioned for an end-dump installation where the waste valve sits at the end of the tank rather than under the belly. The blank is light at about 16 pounds, which makes wrestling it into a tight compartment a one-person job.
This is a waste tank for gray or black water and nothing else; the wall is engineered for sanitation duty and it carries no potable rating. Budget for the load when full: 21 gallons at 8.34 pounds per gallon is about 175 pounds sitting over whatever supports it.
Ronco Plastics has rotomolded these in Tustin, California since 1974, and every one ships with fittings, spin-welded or threaded, placed where you tell them. The technical drawing below prints at scale, so mark your inlet, vent, and valve locations on paper, or click them into place with the fitting planner, and that becomes the build order. The 78H is the other 21 gallon shape, the 10H at 34 x 22 x 12 is the next size up, and the full family is under RV holding tanks. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics 56H 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.
