  In this paper we study a Kaluza-Klein bubble-type spacetime with a magnetic
field first obtained by Sarbach and Lehner in 2005. It is shown that this
solution can be derived via a Harrison transformation of a vacuum Kaluza-Klein
bubble, and its physical and geometrical quantities are determined. For certain
ranges of the magnetic field parameter, this solution carries negative mass.
Furthermore, for a given value of magnetic flux, there exist two branches of
solutions, and the branch with lower mass is thermodynamically favoured. In
light of these properties we interpret the spacetime as another analogue to the
Anti-de Sitter-Melvin solution.
