At 20.75 x 17.75 x 13.75 inches, the B227 is barely bigger than a milk crate - and it holds 20 gallons. That compactness is a genuine trick: most 20 gallon moldings buy their volume with length, but this one keeps all three dimensions under two feet, which opens up the small square voids in transoms, bench seats, and camper-van floors that longer tanks sail right past.
It is a dual-role shell for marine and RV systems, listed for water or waste, and the fitting order is the commitment. Fresh duty runs on FDA-compliant, potable-rated polyethylene; holding duty uses the same seamless rotomolded wall for gray or black water. Nothing is plumbed in advance. Print the drawing below and mark your penetrations - fill, vent, pickup for water; inlet, vent, dump for waste - or place them on the on-page fitting planner, and Ronco spin-welds or thread-installs each fitting to your marks.
The tank ships at 21 lb; full, it holds about 167 lb at 8.34 lb per gallon on a footprint smaller than a seat cushion, so mount it on solid material and strap it into structure. It is molded in Tustin, California by the shop that has been solving small-space tankage since 1974.
Boats start at the boat tank category; van and coach builds at RV water tanks or RV holding tanks; the full range at the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B227 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.
