Seventy gallons is the capacity where a cruising boat stops rationing water. Showers happen. Dishes get properly rinsed. The B343 is Ronco's bare marine blank for that ambition - a 119 lb heavy-wall molding meant to be built into the boat as permanent infrastructure, with a filled weight of about 584 lb that makes it as much a ballast decision as a plumbing one. Site it low and central, and let your builder size the bearers before you fall in love with a location.
No fittings come pre-installed, and at this scale that is exactly right: on a tank this large, port placement determines how many of your 70 gallons you can actually pump out on either tack. Print the drawing below, plot fill, vent, pickup, and sender with the on-page fitting planner, and Ronco spin-welds or thread-installs everything to your marks in Tustin, California - the plant that has molded these since 1974. For potable duty the shell is FDA-compliant; ordered with waste fittings, the same dual-role molding becomes a long-range gray or black holding tank.
A 119 lb blank is real freight, so price the lane first with the freight cost estimator. Then compare the other passage-scale moldings in boat tanks or browse the complete line on the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B343 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.
