SU(5) monopoles,magnetic symmetry and confinement

The monopoles of the unified SU(5) gauge theory broken down to H_E = SU(3)_c ? U(1)_EM or to K_E = SU(3)_c ? SU(2) ? U(1)_Y], are classified. They belong to representations of a magnetic group H_M(K_M), which is found to be isomorphic to H_E(K_E). For SU(5) broken down to H_E, there exists a regular and stable monopole which is a colour magnetic triplet, and carries a non-zero abelian magnetic charge. It is suggested that composite operators made out of this monopole and its antiparticle fields develop a non-zero vacuum expectation value, and so lead to a squeezing of the colour electric flux. Finally, we comment on the cosmological production of SU(5) monopoles.