The ornamental design for a device for use in an irrigation system, as shown and described.
FIG. 1 is a first top perspective view of a device for use in an irrigation system according to our new design;
FIG. 2 is a second top perspective view of the device;
FIG. 3 is a first bottom perspective view of the device;
FIG. 4 is a second bottom perspective view of the device;
FIG. 5 is a front side elevational view of the portion of the device;
FIG. 6 is a top side view of the device;
FIG. 7 is a bottom side view of the device;
FIG. 8 is a right side elevational view of the device; and,
FIG. 9 is a left side elevational view of the device.
The broken lines in the figures are included for the purpose of illustrating unclaimed portions of the device and form no part of the claimed design. The rear side view of the device is not included as no portion of the rear side of the device is claimed.