The present invention relates to a drug delivery device defining a reservoir for containing a product, having a distal end comprising an end-piece defining a channel for the transfer of the product from the reservoir, said drug delivery device comprising means for coupling said end-piece with a connector, said coupling means comprising a collar defined around a portion of the end-piece and extending from the distal end, said coupling means comprising connection means connectable to said collar, said connection means comprising a tubular wall portion having an interface defined thereon for engagement with an internal face of said collar, and a retaining hook having engagement means engageable with at least part of an external face of said collar when said connection means is connected to said collar.
