The B220 goes tall where most dual-role tanks go flat: 30.5 x 20.5 x 18.5 inches, 43 gallons. That 18.5 inch height is the number to notice. Deep lockers, cockpit footwells, and vertical chases waste their headroom on a low-profile tank, and this molding is drawn to claim it - a compact footprint that drinks up the cubic inches other shapes leave behind.
Ronco lists it for marine and RV service, fresh or waste, and ships it as an unplumbed blank either way. Order fill, vent, and pickup and the FDA-compliant polyethylene runs potable duty; order inlet, vent, and dump and the same seamless shell holds gray or black water. Height helps both roles - a taller water column drains harder toward the pickup or dump, so less is left stranded on the bottom.
Empty it is a 36 lb carry; full it is about 359 lb at 8.34 lb per gallon on a 30.5 x 20.5 inch footprint, so the floor under it matters more than usual - solid bearers, straps to structure. Print the drawing below and mark your penetrations, or click them onto the on-page fitting planner, and the Tustin, California shop spin-welds or thread-installs to your marks, as it has since 1974.
Boats: the boat tank category. Coaches: RV water tanks or RV holding tanks. Everything: the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B220 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.
