Dual specificity phosphatase that dephosphorylates MAP kinase pmk1 on a Tyr. Has a role in chloride ion homeostasis by inactivating this pmk1 MAP kinase pathway. H2O + O-phospho-L-tyrosyl-[protein] = L-tyrosyl-[protein] + phosphate Belongs to the protein-tyrosine phosphatase family. Non-receptor class dual specificity subfamily.