PURPOSE: To supply a multifunctional tank which is a compact and highly efficient circuit component by allowing the refrigerant introduced into a tank main body to flow past a first filter gradually laminated inside the main body, deoxidizing and drying agents, a second filter and an oil separation material.

CONSTITUTION: The gaseous Freon discharged in a lower chamber 23 in a main body 11 rises, penetrating through a first filter 14, a deoxidization and dry material 15, a second filter 16 16, and an oil separation material 17 laminated consecutively from the top in the main body 11 and it is discharged outside from an outlet 24. The oil content mixed in the gaseous Freon is separated by the oil separation 17 and accumulated in a lower chamber 23 in the tank main body 11. The water content, oxygen, and other impurities mixed in the Freon gas are removed by the first filter 14, deoxidization and dry material 15, and second filter 16, and then the Freon gas is discharged from the outlet 24 outside the main body. At the same time, the oil content accumulated in the lower chamber 23 is taken out from a discharge port 25 outside the main body 11 together with liquefied refrigerant.