The Ronco Plastics B318 is the generalist of the mid-size B-series: 45 gallons at 40" x 19" x 15.62", proportions that fit under berths, behind settees, and across RV bay floors without demanding a custom space. It is a dual-purpose marine and RV molding - order fresh water fittings and the FDA-grade polyethylene serves potable duty, or order holding fittings and it takes the gray or black waste side. Ship weight is 90 lb; a full load of water runs about 375 lb.
The blank-molding, fittings-per-order approach is what makes one tank do both jobs. Ronco spin-welds or threads each port at the marks you set, so your outlet, fill and vent land where your plumbing runs - not where a template says. Print the drawing below, draw the runs for the role you have chosen, and use the on-page fitting planner to lock the locations before checkout.
Ronco Plastics has molded the B-series in Tustin, California since 1974, and versatile footprints like this one are why the line anchors so many refits. Compare neighbors on our boat tanks shelf, or cross over to RV holding tanks if this molding is destined for the waste side of a coach. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B318 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.
