American Water Heater STJ5-80T 80 Gallon Commercial Storage Tank Ideal storage tank for replacement or customized applications.MEETS ASHRAE/IESNA 90.1-2004.GLASS-LINED TANK - Alkaline borosilicate composition permanently fused to steel by firing at a temperature of 1600°F, providing years of corrosion protection and dependable use.HEAVY GAUGE STEEL JACKET - With baked enamel finish.THREADED OPENINGS - All tanks furnished with threaded openings for thermometer, relief valve, 2” recirculation lines, tank stat, and drain valve.