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We present simultaneous observations of H$_2$O maser emission and radiocontinuum at 1.3 cm carried out with the Australia Telescope Compact Arraytowards two sources, IRAS 16333$-$4807 and IRAS 12405$-$6219, catalogued asplanetary nebula (PN) candidates, and where single-dish detections of H$_2$Omasers have been previously reported. Our goal was to unambiguously confirm thespatial association of the H$_2$O masers with these two PN candidates. Wedetected and mapped H$_2$O maser emission in both fields, but only in IRAS16333$-$4807 the maser emission is spatially associated with the radiocontinuum emission. The properties of IRAS 16333$-$4807 provide strong supportfor the PN nature of the object, hereby confirming it as the fifth known caseof a H$_2$O maser-emitting PN. This source is bipolar, like the other fourknown H$_2$O maser-emitting PNe, indicating that these sources might pertain toa usual, but short phase in the evolution of bipolar PNe. In IRAS 12405$-$6219,the H$_2$O maser and radio continuum emission are not associated with eachother and, in addition, the available data indicate that this source is an H IIregion rather than a PN.

H$_2$O maser emission associated with the planetary nebula IRAS 16333$-$4807