Twenty-three gallons is what you order when twenty is not quite enough and twenty-five will not quite fit. The B136 exists for that specific negotiation - a marine water tank molded to a capacity the round-number catalogs skip, in a 26 lb blank that one person can maneuver into a locker. Hulls are built in odd increments; Ronco's B-series answers in kind.
The polyethylene is FDA-compliant and potable-rated for fresh systems, molded seamless with nothing inside to peel or fail. Full, the tank holds about 192 lb of water at 8.34 lb per gallon. And if the space you measured actually needs holding capacity, the identical blank takes waste fittings instead - the role is set entirely by your fitting order, never pre-plumbed.
Fittings are installed per order at the Tustin, California plant where Ronco has rotomolded since 1974: print the drawing below, mark your spin-weld or threaded fitting locations, or drop them on the on-page fitting planner. The capacities either side of 23 are in boat tanks, and the whole catalog is on the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B136 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.
