The B213 is the shape most people picture when they picture a tank: a clean 28 x 16 x 12.25 inch rectangle, 20 gallons, no exotic proportions. That ordinariness is its virtue. It fits benches, lockers, and underfloor bays in boats and RVs alike, and Ronco lists it for both - as fresh water or as waste holding, with the role set entirely by the fittings you order. The shell is never plumbed in advance; it is a blank until you decide.
Decide fresh, and you get FDA-compliant potable-rated polyethylene feeding your galley and head. Decide waste, and the same seamless rotomolded shell holds gray or black water. The numbers stay the same either way: 22 lb empty - a genuine one-hand carry - and about 167 lb full at 8.34 lb per gallon, resting on a 28 x 16 inch footprint that most floors handle without reinforcement.
Print the drawing below and mark your penetrations: fill, vent, pickup for a water tank; inlet, vent, dump for a holding tank. The Tustin, California shop spin-welds or thread-installs each fitting to your marks before shipping, the same per-order process it has run since 1974. The on-page fitting planner will take the layout by click if you prefer.
Boats start at the boat tank category; coaches at RV water tanks or RV holding tanks; the whole catalog at the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B213 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.
