A connection part (5") for connection to a standardised luer connection or luer lock connection (55"), which comprises a conical region (20"), which is designed for bearing on the conical connection surface (25") of the standardised luer connection or luer lock connection (55"), characterised in that it is designed as a male connection part (5"), that a seal (45) is arranged on the conical region (20") and that the seal (45") is designed as a sealing ring (45") which is arranged over the whole periphery on the conical region (20") and is arranged at the free axial end (40") of the conical region (20").
