The smallest footprint in this stretch of the line: 17 x 12.75 inches, 10 inches tall, 8 gallons. The BOAT41W is the tank for the boat that has exactly one spot left - a console base, a cuddy corner, the void under a leaning post - and needs every one of those gallons to count as proper drinking water rather than jerry-can cargo.
Small as it is, it carries the same H.D. wall as Ronco's biggest marine moldings, in FDA-compliant polyethylene rated for potable use. Tustin, California, since 1974. Fittings are installed per order at the exact locations you mark - spin-welded or threaded - so print the drawing below, set your fill and pickup with the fitting planner on this page, and it ships ready for hose.
Numbers worth knowing: about 67 lb full, 7 lb empty. That empty weight means installation is a one-person job in the tightest space. See what else fits small in boat tanks, check the light-duty range under RV water tanks, or browse everything on the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.