The ICON H4527 31-Gallon Holding Tank is designed for RVs, Fifth Wheels, Travel Trailers, and Campers. Increase your waste tank capacity or replace your leaky waste tank with a durable, impact-resistant ICON Tank. Features one-piece roto-molded construction.• Roto-molded, one-piece construction with spin-welded components• Certified to IAPMO standards• Recessed drain• One 3" hub fitting• Four 1" OD spin weld sensor probes• Capacity: 31 Gallons• 40" x 20" x 12" Certified to IAPMO standards Recessed drain 40"" x 20"" x 12"" | Icon Technologies ICON H4527 Holding Tank, 31 Gal