Material of Expansion Tank :Steel Iron Type of Expansion Tank :Flat Capacity of Expansion Tank :6L/7.5L/10L/12L Max Press of Expansion Tank :3BAR Min Press of Expansion Tank :1BAR Connect of Expansion Tank :NPT 1/2",NPT3/4" We could provide different High quality expansionTank, Pressure Vessel Air Storage Tank,air tank, air cell and some accessories of air tank.We can supply the expansion tank in good quality,reasonable price and delievery them on time.If you are interested in air pressure tank, Pressure Vessel Air Storage Tank,air tank, air cell,please feel free to tell us.