Ten inches tall. That single dimension is why the Ronco Plastics B147 exists: a 35 gallon tank spread across a 48 x 17 x 10 inch footprint slides under berths, cockpit soles, and RV floors that no upright tank will ever enter. And because the B147 is part of Ronco's marine water / waste series, that low-profile shell is two products in one - specify potable fittings and it is a fresh water tank in FDA-compliant polyethylene; specify waste fittings and it is a 35 gallon gray or black holding tank. The molding is identical; your order decides.
Fittings are installed per order - spin-welded or threaded, exactly where you place them. On a tank this long that placement is everything: a pickup at the wrong end of 48 inches leaves gallons stranded when the bow rises. Print the drawing below, mark your ports with the boat's or coach's attitude in mind, and confirm the layout in the fitting planner on this page.
The shell ships at 85 lb; full of water it is about 292 lb, spread helpfully thin across that whole footprint - one reason long, low tanks are kind to trim. Support the entire bottom, not just the ends. Ronco has molded in Tustin, California since 1974.
See companion shapes under boat tanks, waste-side plumbing context at RV holding tanks, the full Ronco line, and shipping via the freight estimator. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B147 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.
