In the title hydrated molecular salt, C6H16N22+·2Br−·2H2O, the complete 1,4-dimethylpiperazine-1,4-diium dication is generated by crystallographic inversion symmetry and both exocyclic C—N bonds are in equatorial orientations. In the crystal, the components are linked by N—H⋯O and O—H⋯Br hydrogen bonds, generating chains propagating in [110].
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