FIG. 1 is a top plan view of a line conditioner, showing my new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a right side elevational view thereof, the left side elevational view being a mirror image of the right side elevational view; and,

FIG. 6 is a front, right, top isometric view thereof.

The broken line showing of the environment is for illustrative purposes only and forms no part of the claimed design.