The ornamental design for a pop-up sprinkler, as shown.
FIG. 1 is a side elevational view of a pop-up sprinkler showing our new
design; and
FIG. 2 is a perspective view thereof.
As illustrated the pop-up sprinkler has an enlarged disc like head which is
attached to the top of a sprinkler carried by a telescopically movable
tube, this head fitting flush into the end of an outer tube secured to a
body by a union nut.