The ornamental design for a containernippleconnector, as shown and described.
FIG. 1 is a top perspective view of the container nipple connector showing the new design;
FIG. 2 is a bottom perspective view thereof;
FIG. 3 is a front elevation view thereof, the rear elevation view being a mirror image thereof;
FIG. 4 is a left elevation view thereof, the right elevation view being a mirror image thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof; and,
FIG. 7 is an elevation view thereof interconnected to a container and a nipple.
The broken line showing of internal elements and a bottle is included for the purpose of illustrating portions of the “article” and forms no part of the claimed design.