Nearly five feet of tank, barely more than a foot wide: the B240 stretches 58 x 13.75 x 12 inches, one of the longest slender moldings in Ronco's marine book. That geometry is a gift to sailboats and long-chassis RVs alike - it lays 40 gallons along a keel line or frame rail where the space was doing nothing, without stealing an inch of usable locker.
A shape this extreme demands structure, and the 90 lb shipping weight is the evidence: heavy walls hold a five-foot span rigid where a lighter molding would ripple. As a B-series dual-role blank, those 40 gallons serve whichever side of the water cycle you assign - food-grade polyethylene for potable fresh when fresh-fitted, or gray and black holding when fitted for waste. It arrives with no fittings installed; print the drawing below, mark every location, and the on-page fitting planner turns your marks into the spin-weld or threaded fittings Ronco installs to order.
Filled, the B240 carries about 334 lb spread along its full length. Give it continuous bedding - foam or a shaped platform end to end - and strap it against surge, because a third of a ton of water moving fore and aft is felt at the helm. Molded in Tustin, California since 1974. See what else runs long and low in our boat tank category, or take in the whole line on the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B240 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.
