Ten gallons in a slim 25.25 x 12.75 x 8 inch bar: the Ronco Plastics B389 slides into chases and narrow lockers that reject anything squarer. Camper vans, small sailboats, and skoolie builds use this format constantly. The B-series shell is dual-role, becoming either a potable fresh water tank in food-grade polyethylene or a small gray or black waste holding tank based on the fittings you order.
The numbers stay friendly: 15 lb empty, about 83 lb full at 8.34 lb per gallon. Almost any panel or frame will carry it with basic strapping.
You place the fittings, not a template. Print the drawing below, mark your connection points, and the factory spin-welds or threads fittings per order at those spots; the fitting planner on this page keeps the details straight. That has been the Ronco way in Tustin, California since 1974.
Compare RV water tanks and RV holding tanks, or see the full Ronco Plastics catalog. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B389 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.
