An attachment for a parenteral device, the device comprising a body and an outlet for conveying fluid, the attachment comprises a housing (12) adapted for engagement with the body, an elongate hollow needle (30), having an outer end (32) and an inner end (34), with an aperture at both ends, a carrier (40) for carrying the needle, the carrier being movable relative to the housing from a first, position, at which the outer end is received within the housing, to a second position at which the outer end extends from the housing and the carrier being movable from second position to first position, and the housing having a flow path extending, when the carrier is in second position, between the outlet and the carrier, wherein the needle is open at the inner end whereby when the carrier is positioned in second position the inner end is brought into communication with the flow path.
