One hundred twenty-five gallons of marine water capacity, shipped exactly as it comes out of the mold - no fittings, no assumptions. The B243 is the tank for vessels that measure water in days offshore rather than afternoons at anchor, and at this scale the blank-molding approach stops being a nicety and becomes essential: a tank this large gets plumbed around engine beds, bulkheads, and hose runs that no factory layout could predict.
So Ronco lets you dictate all of it. Print the drawing below, mark every fill, vent, pickup, and inspection location, and use the on-page fitting planner to choose spin-weld or threaded fittings; the tank arrives with them installed to your marks. In fresh service the food-grade polyethylene is built for potable water, and because the B-series molds dual-role, the same blank can be fitted as a very large gray or black holding tank instead.
The numbers deserve respect: 128 lb empty, and about 1,042 lb - over half a ton - when full. That load belongs low, centered, on a platform tied to real structure, with chafe-protected strapping. A tank this size ships as freight, so run your ZIP through the freight cost estimator before you plan the install weekend. Molded in Tustin, California, as Ronco has done since 1974. See the rest of the big-water options in our boat tank category or on the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B243 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.
