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The title compound, [Mn(C6H4N5O)2(H2O)4], is isotypic with its Zn, Ni and Cd analogues reported recently. In the crystal, the MnII cations are coordinated by four O atoms from four aqua ligands and two N atoms from two 5-(pyridin-4-yl)tetrazolide N5-oxide ligands in a distorted octahedral coordination environment. The asymmetric unit consists of one MnII cation located on a crystallographic twofold axis, and two crystallographically independent water molecules and one N-donor ligand in general positions. The discrete complex molecules are arranged in alternating rows parallel to [100] and are linked by O—H...N and O—H...O hydrogen bonds into a three-dimensional network.