The B222 spreads 40 gallons into a 42 x 26.75 x 9.5 inch slab, and that 9.5 inch height is its entire argument. Underfloor bays, shallow bilge flats, and the space beneath RV galleys rarely offer more than a hand-span of depth; this molding turns that sliver into serious capacity by going wide and long instead of tall. Same 40 gallons as a cube-style tank, completely different real estate.
It is another of Ronco's dual-role shells - marine or RV, water or waste, the choice locked in by your fitting order and never plumbed in advance. Fresh systems get FDA-compliant potable-rated polyethylene; holding service gets the same seamless rotomolded construction. Shallow tanks demand precision at order time: with only 9.5 inches of depth, a pickup or dump even slightly off the true low point leaves water behind, so study the drawing below, decide how the tank will sit installed, and mark accordingly - or place the penetrations on the on-page fitting planner. Ronco spin-welds or thread-installs to your marks.
It ships at 93 lb, and full it distributes about 334 lb (8.34 lb per gallon) across a generous 42 x 26.75 inch footprint - one of the gentler structural asks in this capacity class, since the load spreads instead of stacking. Molded in Tustin, California by the shop that has specialized in exactly these awkward-space problems since 1974.
More shallow-bay candidates live in the boat tank category and RV holding tanks; the full catalog is on the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B222 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.
