When a coach was built around a 37-gallon waste tank, a 35 or a 40 does not solve the problem - the plumbing stubs and the cavity were framed for that shape. The 73H exists for those installs: one of Ronco's two 37-gallon gray/black holding moldings, seamless rotomolded polyethylene, 34 lb as a blank shell and roughly 309 lb with a full load aboard.
Identification is the whole game with replacement holding tanks, so use the drawing below - print it, match the outline and the dump position against what came out of the coach, and mark your fitting locations on the same sheet. Ronco spin-welds or threads every drain, vent, and inlet per order, which means an older coach with fittings in odd places is no harder to serve than a new build.
If the 73H is not the match, check its capacity twin the 66H, the 36-gallon 85H, or the 38-gallon RV53W if what you actually need is a fresh tank at this size. The full waste-side index is at RV holding tanks, all of it molded in Tustin, California by the same shop since 1974. Gray and black water only - no potable use.
OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics 73H 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.
