An attachment arrangement (10) has a housing (12) and a needle (34) located within the housing. The arrangement allows administration ports of different sizes to be inserted into and secured within the housing. In certain embodiments, compliant retainers (26) secure the administration port within the housing. In certain other embodiments, the administration port is secured within the housing when the housing is compressed against the administration port by a housing compression element (48). Once the administration port is secured within the housing, a fluid-tight seal is formed between the attachment device and the administration port.
