The B209 is liveaboard tankage: 70 gallons in one marine molding, which is the difference between watching the gauge and forgetting about it for a week. Like the rest of Ronco's dual-role B-series it is molded to serve either as an FDA-compliant fresh water tank or as a gray/black holding tank - the fittings you order decide the job, and the tank ships committed to that job.
Respect the numbers. Seventy gallons of water is about 584 lb, and the blank alone ships at 120 lb, so this tank wants engineered support: a flat, framed bed that carries the floor of the tank across its full footprint, with chocks or straps taking the fore-and-aft loads. Foam wedged against flanges is not a mounting plan at this scale.
Ronco spin-welds or thread-installs every fitting to your marks at the Tustin, California plant it has operated since 1974. Print the drawing below, lay out fill, vent, suction, and any inspection port, then lock the layout in with the on-page fitting planner.
At this ship weight the tank moves by LTL freight - price the lane with the freight cost estimator before you commit the layout. More sizes under boat tanks and the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.
