Described are improvements to components of fluid transfer apparatuses comprising a first component, e.g. a syringe, a connector component configured to connect between the first component and an adapter component that is configured to allow connection of the connector component to a second component of the drug transfer apparatus, e.g. to a drug vial. The improvements include inter alia changes to the sealing elements that seal the proximal end of the syringe, redesign of a septum holder inside the connector component and corresponding redesign of the housing of the connector component； changes to the structure of the end of the connector component that connects to the first component to allow the first component to swivel relative to the connector component； and changes to the design of the adapter component to a second component of the drug transfer apparatus to allow it to mate with the redesigned housing of the connector component.
