The Ronco Plastics B403 pairs 38 gallons of capacity with a 105 lb heavy-wall molding, sitting near the top of the B-series for wall mass in its size class. Spec it where the tank works for a living: charter boats, patrol skiffs, rigs that cycle daily. As with every B-series shell, the role is chosen at order time; potable fittings deliver a food-grade fresh water tank, waste fittings deliver a gray or black holding tank.
Filled, it carries about 317 lb of water at 8.34 lb per gallon, well within what this wall section supports.
The factory spin-welds or threads every fitting per order at the positions you mark. Print the drawing below, plot your plumbing, and let the fitting planner on this page turn the layout into a build spec. This one-order-at-a-time finish has come out of Ronco's Tustin, California plant since 1974.
See related marine tanks, RV holding tanks, and the freight estimator. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B403 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.
