Seventy-five gallons is the point where a water tank stops being a component and starts being ballast. The B334 is one of the largest bare marine moldings Ronco offers, a 122 lb heavy-wall blank meant for boats provisioning for real time away from a dock - and its filled weight, about 626 lb, is the number your installation has to be designed around. Keep it low, keep it centered, and give it bearers sized for a third of a ton, because that is what a topped-off tank is.
It ships without fittings by design. Big tanks are exactly where factory port placement hurts most - a pickup on the wrong end means unusable gallons every time you heel - so Ronco lets you place every port yourself. Print the drawing below, mark your locations with the on-page fitting planner, and each fitting is spin-welded or thread-installed to your spec in Tustin, California, where these tanks have been molded since 1974. For potable service the polyethylene is FDA-compliant; the same dual-role B-series shell can instead be fitted as a large gray or black waste holding tank for vessels chasing pumpout independence.
At 122 lb the blank itself is freight worth pricing early - the freight cost estimator quotes your ZIP before you commit. Compare the other large-capacity moldings in boat tanks, and see the maker's whole range on the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B334 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.
