The B325 is the shape you reach for when the space you have is a box, not a slot. Its 17 gallons sit in a 19.5 x 18 x 12 inch molding that is nearly square in plan - a proportion that fits lazarettes, under-settee lockers, and the odd cubic voids that boat builders leave behind machinery. Where the low-profile tanks in this line trade height for length, the B325 does the opposite: it goes deep and stays short, so it drops into spaces a 30-inch blank could never turn into.
It is a true dual-role B-series molding. Order it with fresh water fittings and you get an FDA-compliant potable tank; order it plumbed-for-waste and the identical shell becomes a gray or black holding tank. Either way it leaves Tustin, California - where Ronco has rotomolded since 1974 - as a 19 lb blank with your fittings spin-welded or thread-installed to the marks you give us. The drawing below prints at home; the fitting planner on this page walks you through placing each port.
Filled, the tank holds about 142 lb of water, so give the bottom a flat, supported landing. If the compartment you are measuring is shallower than 12 inches, the low-profile end of our boat tank range is where to look next; RV installers should start at RV water tanks for the fresh side or RV holding tanks for waste. The whole catalog lives on the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B325 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.
