SDML: 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 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. Features: Additives consuming no oil Joint type: ODF or SAE Corrosive resistance mold Max working pressure: 4.2Mpa SDCL: This machine uses 80% 3A molecular sieve core and 20% active aluminum inside, it is a perfect core mixture for the equipment system which has strong drying requirement and work under lowest frozen temperature. It has best result to apply to refrigeration of CFC &HCFC(R22,R502) using with petrol and Alkyl-phenyl oil. Features Joint type: ODF or SAE Corrosive resistance mold Max working pressure: 4.2Mpa.