Amtrol ST-12 Thermal Expansion Tank

Nothing is more reliable than the Amtrol ST-12 Thermal Expansion Tank. This essential is built with high-strength steel and heavy-duty butyl and keeps your home water pressure in check by absorbing expanded water in closed hot water systems. Key Features:  Antimicrobial liner neutralizes bacteria on contact Patented Turbulator water circulation device Strongest tank design featuring deep-drawn steel and multi-dome construction Heavy-duty butyl forms a thick diaphragm Projection welded air stem to reduce leaks Specifications:  Shell: High-strength steelDiaphragm: Heavy-duty butyl NSF/ANSI 61Liner: AntimicrobialAir Valve: Projection weldedAir Valve Cap: Patented InSight Indicator CapFactory Precharge: 50 PSIG for in-line models, 40 PSIG for stand modelsMax. Operating Temperature: 200º F (93º C)Max. Operating Temperature for ST-1: 140º F (60º C)Max. Working Pressure: 150 PSIG (10.3 bar)Warranty: ST-1 through ST-12: 7-Year Limited, ST-25V through ST-210V: 1-Year Limited Benefits and Adva