Enables inositol bisphosphate phosphatase activity. Acts upstream of or within inositol phosphate dephosphorylation and phosphatidylinositol dephosphorylation. Located in cytosol and membrane. Is expressed in several structures, including alimentary system; central nervous system; integumental system; peripheral nervous system ganglion; and sensory organ. Orthologous to human MTMR7 (myotubularin related protein 7). [provided by Alliance of Genome Resources, Apr 2022]