The B257 packs 20 gallons into an 18.5 x 18 x 16 inch near-cube - the most compact way Ronco molds this capacity. Where its slimmer siblings trade length for a low profile, this one trades nothing but a little height, fitting 20 gallons onto a footprint most builds can find under a seat, in a locker corner, or beside a wheel well.
What those 20 gallons do is your fitting order's decision. As a B-series dual-role molding it is potable fresh supply in food-grade polyethylene when fresh-fitted, or a gray/black holding tank when fitted for waste - the same blank either way, and it arrives with nothing installed. Print the drawing below, mark your fitting locations, and the on-page fitting planner specs the spin-weld or threaded fittings Ronco installs to your marks.
Twenty-two pounds empty, about 167 lb full: solo install, but strap and support like it matters, because loaded water always does. Molded in Tustin, California since 1974. Compare the cube against longer 20s in our boat tank category and RV holding tanks, or browse everything at the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B257 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.
