Most 40 gallon tanks buy their capacity with length. The B252 buys it with height instead: 26.5 x 21.25 x 18 inches, a compact block that fits where the long slabs cannot - a deep cockpit locker, a single RV bay, the void beside a wheel well. If your available space is a box rather than a corridor, this is the 40 you want.
It is a B-series dual-role blank, so the box becomes whatever your system lacks: potable fresh supply in food-grade polyethylene when fresh-fitted, or gray/black holding when fitted for waste. Ronco ships it unplumbed - print the drawing below, mark each fitting location, and the on-page fitting planner turns the marks into spin-weld or threaded fittings installed per order.
The molding is 34 lb empty and carries about 334 lb full, concentrated on a compact footprint - so set it on structure, not paneling, and strap it well. Molded in Tustin, California since 1974. Compare it against the long-and-low alternatives in our boat tank category and RV water tanks, or browse the whole family at the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B252 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.
