THERM-X-TROL ST-42V-C ASME Expansion Tank (18 Gallon Volume)

Amtrol thermal expansion tanks are engineered to control pressure build-up in closed, potable water systems. Available in diaphragm, full acceptance and partial acceptance bladder designs, all Therm-X-Trol expansion tanks are made in the USA at our ISO 9001 : 2008 registered facilities. ASME tanks meet Section VIII, Division 1 Standards. Features Accepts expanded water caused by thermal expansion. Returns water to the system when hot water is used. Protects water heater and fixtures. Eliminates wasted energy and water. Prevents dangerous pressure build-up. Eliminates a potential safety hazard. Diaphragm Models Heavy duty butyl diaphragm; industry's thickest. Fixed diaphragm construction for leak-free performance.