Enables several functions, including phosphoprotein phosphatase activity; protein kinase binding activity; and protein kinase regulator activity. Involved in negative regulation of JUN kinase activity; positive regulation of JNK cascade; and positive regulation of JUN kinase activity. Acts upstream of or within JNK cascade; negative regulation of MAPK cascade; and protein dephosphorylation. Located in cytoplasm. Orthologous to human DUSP19 (dual specificity phosphatase 19). [provided by Alliance of Genome Resources, Apr 2022]