A medical connector comprising: a body having an internal cavity, an inlet port, at least one outlet port through a male luer portion of the body, and a fluid path extending from the inlet port to the at least one outlet port; a retractable post extending through the fluid path in the male luer sealing a tip of the male luer thereby closing the fluid path when the connector is not activated, and one or more barb arms (213a, 213b) extending through vent holes in the body and along the exterior of the male luer and being connected to the retractable postat a top of the barb; a first seal comprising an elastic cup having a seating ring the seating ring (211 being coupled to the body with the elastic cup extending into the internal cavity and receiving the top of the barb, the first seal configured to form an internal fluid volume of the internal cavity between the seal and the inlet port, the fluid path passing through the internal fluid volume; wherein, the connector is activated when a pressure is applied to the one or more barb arms (213a, 231b) in a direction away from the outlet port such that the retractable post is forced away from the tip of the male luer, thereby biasing the elastic cup of the first seal further into the internal cavity, opening the fluid path through the medical connector and decreasing the internal fluid volume, and the connector is deactivated when the pressure is removed from the one or more barb arms (213a, 213b) such the elastic cup moves the retractable post toward the tip of the male luer, thereby increasing the internal fluid volume and closing the fluid path through the medical connector. a body having an internal cavity, an inlet port, at least one outlet port through a male luer portion of the body, and a fluid path extending from the inlet port to the at least one outlet port; a retractable post extending through the fluid path in the male luer sealing a tip of the male luer thereby closing the fluid path when the connector is not activated, and one or more barb arms (213a, 213b) extending through vent holes in the body and along the exterior of the male luer and being connected to the retractable postat a top of the barb; a first seal comprising an elastic cup having a seating ring the seating ring (211 being coupled to the body with the elastic cup extending into the internal cavity and receiving the top of the barb, the first seal configured to form an internal fluid volume of the internal cavity between the seal and the inlet port, the fluid path passing through the internal fluid volume; wherein, the connector is activated when a pressure is applied to the one or more barb arms (213a, 231b) in a direction away from the outlet port such that the retractable post is forced away from the tip of the male luer, thereby biasing the elastic cup of the first seal further into the internal cavity, opening the fluid path through the medical connector and decreasing the internal fluid volume, and the connector is deactivated when the pressure is removed from the one or more barb arms (213a, 213b) such the elastic cup moves the retractable post toward the tip of the male luer, thereby increasing the internal fluid volume and closing the fluid path through the medical connector.