The Ronco Plastics B315 concentrates 52 gallons into a 30.5" x 24.38" x 17.38" block that weighs just 41 lb empty - a capacity-to-weight ratio that makes it one of the easiest big tanks in the B-series to actually get into a boat or coach. It is a dual-purpose marine and RV molding: fresh water tank or gray or black waste holding tank, with the role fixed by the fittings you order. Filled with water it carries about 434 lb, so the light shell still deserves a serious shelf.
Ronco spin-welds or threads every fitting at the locations you mark, which is how one blank serves both jobs. Choose the role, then place the ports to match: low pickup and high vent for potable service on the FDA-grade polyethylene, or a full-bore discharge and rinse port for holding duty. Print the drawing below, sketch your hose runs, and settle the final layout with the on-page fitting planner before the order goes in.
Molded in Tustin, California, where Ronco Plastics has built the B-series since 1974, the B315 shares our boat tanks shelf with its near-twin footprints - worth a side-by-side look. The waste-side family is collected under RV holding tanks when your project points that way. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B315 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.
