Catalysis of the reaction: 3-diphospho-1D-myo-inositol 1,2,4,5,6-pentakisphosphate + H2O = 1D-myo-inositol 1,2,3,4,5,6-hexakisphosphate + phosphate + 2 H+.
inositol-3-diphosphate-1,2,4,5,6-pentakisphosphate diphosphatase activity