Gallons: 5. Dimensions: 16″ L x 11-3/4″ W x 8″ H. A vast array of combo water/waste tank sizes ensures you the right fit for your vessel needs. Features nominal wall thickness of 0.30″ (7.6mm). Provides standard NPT openings for vent, fill and drain. Polyethylene tanks will not filter taste into water or emit waste odors. Resin meets FDA spec CFT177 1520 requirements. Satisfies all U.S. Coast Guard standards.