The B133 is a pancake: 57 x 26.5 x 9.25 inches, under ten inches tall, spreading 53 gallons across nearly five feet of floor. Tanks this flat are how big capacity hides under a berth or an RV floor without stealing an inch of living space - and 53 gallons is the largest capacity in this shape class of Ronco's dual-role range. Fresh fittings make it a potable tank in FDA-compliant polyethylene; waste fittings make it a maximum-capacity holding tank. It ships plumbed for neither.
The blank weighs 105 lb - a thick wall is non-negotiable when a tank is this wide and this flat - and full it carries about 442 lb of water at 8.34 lb per gallon, distributed low and evenly. Support the entire footprint; a flat tank bridging two joists will find the gap.
Fittings are installed per order at Ronco's Tustin, California plant, rotomolding since 1974: print the drawing below, mark your spin-weld or threaded fitting locations, or place them on the on-page fitting planner. A blank this size warrants an early quote on the freight cost estimator. Its upright cousins live in boat tanks and RV holding tanks; everything else is on the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B133 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.
