Amtrol ST-8 is 3.2 gallons In-Line Model of Therm-X-Trol searies expansion tank designed to control pressure build-up in closed, hot water systems. Equipped with the thickest diaphragm that provides extra strength and flexibility. Polypropylene tank liner provides 100% corrosion resistance and complies with NSF International Standard for clean and safe water storage.
Materials of Construction: