apertures 168 fig1 and 11 illustrate yet another embodiment of the invention this embodiment is generally similar to that of fig8 and 9 except that the walls 136 a 136 b of the conduits 134 a 134 b do not include apertures instead the walls 137 that bound the opposite circumferential edges of the walls 136 a 136 b include cutouts 170 at the edges of the walls 137 that abut an opposite wall 172 of the compressor housing the wall 172 the walls 137 and the wall 136 a 136 b of each passage collectively form a pair of substantially closed flow paths that lead the fluid into the second stage inlet from diametrically opposite radially inward directions the cutouts 170 allow fluid to move from the flow passage 166 into these inlet flow paths and hence back to the second stage impeller inlet fluid can also move in the opposite direction from the inlet flow paths into the flow passage 166 and then through the ports 164 to the inducer of the second stage impeller another embodiment of the invention is depicted in fig1 and 13 this embodiment is generally similar to the previously described one except that the walls 137 u2032 define u201c cutouts u201d 170 u2032 that extend the full lengths of the walls 137 u2032 u2014 i e there is.