Devices having male connectors for preventing connection to non-compatible female connectors are described. An exemplary male connector includes an elongate tip and a collar disposed coaxially around the elongate tip including a plurality of ribs disposed on either an inside surface or an outside surface of the collar for preventing entry of a non-compatible female connector into a channel formed between the elongate tip and the collar. One or more embodiments pertain to a device with a male connector and a compatible female connector including a threaded portion for engaging a corresponding threaded portion of the male connector.
