  There is mounting evidence for triplet superconductivity in the recently
discovered skutterudite compound PrOs_4Sb_12. In this work, we propose nodal
order parameters for the A- and B-phases of this superconductor which are
consistent with angle dependent magnetothermal conductivity measurements and
with low-temperature thermal conductivity data in the range T > 150 mK. The
quasiparticle density of states and the thermal conductivity kappa_zz are
derived within the quasiclassical approximation.
