The B239 is built for the space every boat has and no tank fits: the long, narrow channel between stringers. At 48 x 14 x 10 inches it runs four feet down the hull while staying just 14 inches wide, turning a dead corridor of bilge into 28 gallons of capacity. The 81 lb molding weight tells you how much material Ronco puts into a shape this long - thick walls that keep a four-foot span from flexing as the boat works.
Water or waste is your call, because this is a B-series dual-role blank. Fresh-fitted, the food-grade polyethylene handles potable supply; waste-fitted, the same tank holds gray or black water until the next pump-out. Either way it arrives unplumbed: print the drawing below, mark your fitting locations along that long top face, and the on-page fitting planner specs the spin-weld or threaded hardware Ronco installs per order.
A full load is about 234 lb distributed along the four-foot run - support it continuously, not just at the ends, so the middle never sags. Rotomolded in Tustin, California, where Ronco has been making exactly these shapes since 1974. Long and narrow has siblings in both our boat tank category and RV water tanks; the maker's complete range is on the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B239 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.
