We present the morphology and linear polarization of the 22-GHz H _ { 2 } O masers in the high-velocity outflow of two post-AGB sources , d46 ( IRAS 15445 - 5449 ) and b292 ( IRAS 18043 - 2116 ) .
The observations were performed using The Australia Telescope Compact Array .
Different levels of saturated maser emission have been detected for both sources .
We also present the mid-infrared image of d46 overlaid with the distribution of the maser features that we have observed in the red-shifted lobe of the bipolar structure .
The relative position of the observed masers and a previous radio continuum observation suggests that the continnum is produced along the blue-shifted lobe of the jet .
It is likely due to synchrontron radiation , implying the presence of a strong magnetic field in the jet .
The fractional polarization levels measured for the maser features of d46 indicate that the polarization vectors are tracing the poloidal component of the magnetic field in the emitting region .
For the H _ { 2 } O masers of b292 we have measured low levels of fractional linear polarization .
The linear polarization in the H _ { 2 } O maser region of this source likely indicates a dominant toroidal or poloidal magnetic field component .
Since circular polarization was not detected it is not possible to determine the magnetic field strength .
However , we present a 3 - \sigma evaluation of the upper limit intensity of the magnetic field in the maser emitting regions of both observed sources .