Expansion Tanks absorb hot water expansion in closed heating
systems. They are equipped with butyl diaphragms to separate the air from the system water. Pre-pressurized, the tank keeps fluids circulating and
maintains minimum pressure. • Butyl/EPDM diaphragm- 9 times better than natural rubber • Deep-drawn steel tank • Controls system pressure • Air-tight
cushion-factory pre-charged to 12 psig and 100% tested