A connector for use with a reservoir. The connector comprises a main body defining a bore extending from a proximal end to a distal end of the main body. The bore is configured for receiving the reservoir. An inner wall extends from the proximal end to the distal end. At least a portion of the inner wall is configured for attachment to an outer surface of the reservoir. An outer wall extends from the proximal end and the distal end. The outer wall is configured for attachment to a drug delivery device. In one arrangement, the outer wall is configured for attachment to a cartridge holder of the drug delivery device.
