... -134a, R-404a, R-507, R-410A, R-407C ... etc DW Series75% of molecular sieve, 20% activated alumina, 5% carbon.This ... .. HW Series95% of molecular sieve,5% carbon.This type of drier core added the activated carbon, it suitable for Burn-off ... , and can guarantee a large water absorption capacity of the drier filter core.Suitable for refrigerant: R-12, R-22, R ...