At 39 lb for 28 gallons, the Ronco Plastics B374 is one of the easier B-series tanks to wrestle into a tight compartment, and on smaller boats that installation weight matters. It is a dual-role marine molding: fitted for potable service, the food-grade polyethylene shell carries fresh water; fitted for waste, the same shell runs as a gray or black holding tank. You choose the role when you choose the fittings.
Once plumbed and filled, expect about 234 lb of water at 8.34 lb per gallon. Light tank, real load; support the base fully rather than hanging it from tabs.
Fittings go on per order, spin-welded or threaded at the positions you mark. Print the drawing below, note where your plumbing wants to enter and exit, and use the fitting planner on this page to specify sizes. Ronco has been finishing tanks to individual order in Tustin, California since 1974.
More sizes under boat tanks or the complete Ronco Plastics catalog. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B374 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.
