Icon holding tanks are thermoformed of high impact ABS plastic. All seams are solvent welded and have a 1-1/4" mounting flange around the perimeter for easy installation. The HT620ED Holding Tank from Icon features a center end drain and a 10 gallon holding capacity. The dimensions of this tank are 32" x 20" x 6.5". Comes with 3" spigot fittings and four level sensors installed on the tank.