Sprinkler

FIG. 1 is a first top perspective view of a sprinkler, according to the new design; FIG. 2 is a second top perspective view of the sprinkler with a sprinkler head omitted; FIG. 3 is a third top perspective view of the sprinkler with the sprinkler head omitted; FIG. 4 is a fourth top perspective view of the sprinkler with the sprinkler head omitted; FIG. 5 is a fifth top perspective view of the sprinkler with a sprinkler head omitted; FIG. 6 is a front elevational view of the sprinkler with the sprinkler head omitted; FIG. 7 is a rear elevational view of the sprinkler with the sprinkler head omitted; FIG. 8 is a top plan view of the sprinkler with the sprinkler head omitted; FIG. 9 is an enlarged view of region 9 of FIG. 8 ; FIG. 10 is an enlarged view of region 10 of FIG. 8 ; FIG. 11 is a bottom plan view of the sprinkler; FIG. 12 is a left side elevational view of the sprinkler with the sprinkler head omitted; FIG. 13 is a right side elevational view of the sprinkler with the sprinkler head omitted; and, FIG. 14 is a first top perspective view of a second embodiment the sprinkler with the sprinkler head omitted. The dash-dash broken lines in the figures are included for the purpose of depicting portions of the sprinkler that form no part of the claimed design. The dot-dash broken lines in the figures represent boundaries of the claimed design that form no part of the claimed design. The dot-dot-dash broken lines shown in the figures are for the purpose of illustrating boundaries of the enlarged views and form no part of the claimed design. The claimed portion of the second embodiment is identical to the claimed portion of the first embodiment and, therefore, only a single view of the second embodiment is provided.