Fifteen gallons in 20 x 15 x 12 inches: the B131 is the tank you can actually find room for. Its compact brick of a footprint fits under dinette seats, in cockpit lockers, and against van wheel wells, which is why Ronco bills it for marine and RV service alike. It is a dual-role blank besides - fresh water or gray/black waste, decided entirely by which fittings you order, shipped plumbed for neither.
In fresh service the polyethylene is FDA-compliant and potable-rated, molded seamless. The numbers stay friendly at both ends: 17 lb empty, about 125 lb full at 8.34 lb per gallon - a one-person install and a modest structural ask, provided the base is fully supported and strapped.
Ronco rotomolds it in Tustin, California, where the shop has run since 1974, and installs spin-weld or threaded fittings per order at your marks: print the drawing below and mark the locations, or use the on-page fitting planner as you order. Compact company lives in boat tanks and RV water tanks; the full catalog is on the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B131 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.
