Most 17-gallon tanks sprawl; the B359 stacks. At 19.75 x 15.75 x 14 inches it is nearly as tall as it is wide - a deep, compact molding for the vertical spaces boats actually have in abundance: lazarette corners, cockpit locker floors, the void beside an engine box. If your available space is a hole rather than a shelf, this is the 17-gallon shape that uses it.
Ronco lists it as water or waste, and the same blank serves either master. With fresh fittings it is FDA-compliant polyethylene, a potable supply sized for a weekender; with waste fittings it becomes a gray or black holding tank whose tall, small-footprint form drops beside a head compartment where flat tanks cannot go. The ports land where you mark them: print the drawing below, plot each fitting with the on-page planner, and Ronco spin-welds or thread-installs them in Tustin, California - to-order molding as practiced there since 1974.
Two numbers for the install: 19 lb empty, about 142 lb full. A taller tank carries its water higher, so this one especially wants a snug chock and a strap that takes real tension. Flatter 17-gallon alternatives and every neighboring size are in the boat tank category; the trailer-side selection is under RV water tanks and RV holding tanks; the whole family is on the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B359 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.
