A port/spike assembly (10) including an enteral spike (12) having a diameter substantially less than the diameter of a standard parenteral spike (40). The assembly (10) also includes a port (20) having a tube (24) with an outer wall (28) which defines a generally cylindrical elongated bore (30). A frangible membrane (32) is disposed inside the elongated bore (30), and divides the bore (30) into upper and lower bore sections (34,36). A selector ring (38) is provided in the upper bore section (34) for permitting insertion of the reduced diameter enteral spike (16,12) and for preventing the insertion of a standard parenteral spike (40) through the membrane (32). The assembly (10) prevents inadvertent insertion of a parenteral spike (40) into an enteral feeding system.
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