The present invention relates to a medical device connector for connecting a piercing device, with a vial comprising a base member. A plurality of grip members, each grip member comprising a distal end (D) and a proximal end (P) and each comprising a wedge portion adapted to temporarily or permanently lock the medical device connector to the vial. The base member further comprises a plurality of flanges, wherein the proximal ends (P) of the grip members are arranged to the flanges. The flanges extend substantially out from the periphery of the base member in a direction substantially perpendicular to the direction of the grip members, wherein the space formed between the flanges of the base member forms at least one grip portion. The present invention provides for a medical device connector which is easy and comfortable to use, which provide good stacking capabilities and which permits a user to readily acknowledge that the medical device connector is correctly assembled with the vial.
