The Ronco Plastics B502 is the substantial take on 30 gallons: an 87 lb molding with wall thickness to spare, aimed at installations that will see decades of thermal cycling, sloshing loads, and the general violence of life aboard. Buy the wall once, never think about it again.
It is a dual-role B-series molding, one shell with two possible lives. Ordered for fresh water, it stores potable supply in food-grade polyethylene. Ordered for waste, it serves as a gray or black holding tank with the same overbuilt skin. Ronco installs your fittings per order, spin-welded or threaded to your marked positions, so heavy wall never translates to hard installation.
Do the structural math on about 250 lb of water at 8.34 lb per gallon, plus the tank; a full B502 is a serious fixed load. Print the dimensioned drawing below, verify your compartment, and lock in the port layout through the on-page fitting planner.
Molded in Tustin, California by Ronco Plastics, in operation since 1974. The lighter 30 gallon moldings in the marine collection show the other side of the trade, the 30 gallon holding tank covers dedicated waste, and the freight cost estimator prices your lane. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B502 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.
