125 PSIG Working Pressure;Strongest Tank Design Featuring Deep Drawn Steel and Multi-Dome Construction;Welded Steel Base is Stronger than Plastic;Heavy Duty Butyl Diaphragm;Patented Turbulator Water Circulation Device;Polypropylene Liner meets NSF International Standard 61;Welded Air Stem to Help Eliminate Leaks;Stainless Steel System Connection;5-Year Limited Warranty