If N is any cartesian product of a closed simply connected n-manifold $N_1$ and a closed aspherical m-manifold $N_2$, then N is a codimension 2 fibrator. Moreover, if N is any closed hopfian PL n-manifold with $pi_iN=0$ for $2 {leq} i < m$, which is a codimension 2 fibrator, and $pi_i N$ is normally cohopfian and has no proper normal subroup isomorphic to $pi_1 N/A$ where A is an abelian normal subgroup of $pi_1 N$, then N is a codimension m PL fibrator.