Size a water tank by crew-days, not by the biggest number that fits: at sensible washing-and-drinking use, the B170's 28 gallons covers a couple for a long weekend with margin. It is one of Ronco's dual-role marine moldings - ordered fresh it is FDA-compliant potable polyethylene, ordered as a holding tank the identical shell takes gray or black waste - so the same part number solves either side of the plumbing diagram.
Full, 28 gallons is roughly 234 lb of water. That is ballast if you place it low and a roll moment if you do not, so treat placement as a naval-architecture decision, not a storage decision. The unfitted blank weighs 36 lb.
Fittings go on per order at the Tustin, California plant - spin-weld or threaded, located to your spec, as Ronco has done since 1974. Print the drawing below, mark it up, and translate the marks into the on-page fitting planner so the tank arrives ready to plumb.
Browse the marine range under boat tanks, the land equivalents under RV water tanks, or everything at once on the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.
