Product details:

Amtrol ST-5 (Therm-X-Trol) is a water heater expansion tank, designed for use in domestic hot water heating systems to eliminate the potential hazards of water expansion. Water heater expansion tank is commonly installed in a domestic hot water system that contains a backflow preventer, a check valve or a pressure reducing valve. - Factory pre-charged 40 psig - System connection: 3/4 inch male threaded - Stainless steel system connection - Max. operating temperature: 200FMax. operating pressure: 150 psi - Expansion tank volume: 2.0 gallons - Max. acceptance factor: 0.45Height: 12-5/8 inch - Diameter: 8 inch - Eliminates the waste of energy and water, thus saving money - Protects the water heater and plumbing fixtures from premature failure - Reduces potential safety hazards associated with thermal expansion - Prevents a dangerous pressure build-up in the system - Prevents the relief valve from going off - Therm-X-Trol brand is the #1 choice of Professional Installers - NSF/ANSI 61u00ae, IAPMO, SBCCI & City of Los Angeles listings.