We use 100%3A molecular sieve core in the Filter Drier, it has strong drying capability to maximum reduce the risk of hydrolyze acid reaction, and it can work with HFC refrigerant (R134a, R404A, R410A) which is used with POE & PAG oil together, it is also an non-oil consuming additive compatible with R22.     1.Additives consuming no oil 2.Joint type: ODF or SAE 3.Corrosive resistance mold 4.Max working pressure: 4.70Mpa/680PSIG       It has achieved the highest level of UL certification, and been sold to the high-end market in the USA.