A simple model for precipitation of trapped particles from an asymmetric magnetic flux tube is formulated and analytic solutions are found in the strong diffusion and weak diffusion limits. The loss cones &agr;&pgr;-&agr;2 (&agr; = pitch angle) are assumed unequal (&agr;1D(&agr;2) and at foot 2 for D(&agr;2)>D(&agr;1), is described in terms of a factor F(d) of an asymmetry parameter d given by equations (35) and (24), respectively. Applications to the solar corona, to Jupiter's radio emission and to the terrestrial magnetosphere are discussed briefly.