One hundred gallons is expedition capacity, and the Ronco Plastics B400 delivers it in a single B-series molding shipping at 127 lb. This is the tank for long-range cruisers, crew boats, and coaches that measure trips in weeks. The dual-role shell works both sides of the water system: potable fittings make it a food-grade fresh water tank; waste fittings make it a high-capacity gray or black holding tank.
Do the load math early: 100 gallons of water weighs about 834 lb at 8.34 lb per gallon. Structure first, tank second; this capacity gets designed in, not squeezed in.
The factory installs fittings per order, spin-welded or threaded where you mark them, so the plumbing matches your build drawings rather than a generic template. Print the drawing below, plot every connection, and use the fitting planner on this page. Ronco has built to order in Tustin, California since 1974.
See more large boat tanks, browse RV holding tanks, and price shipping with the freight estimator. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B400 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.
