FIELD: medicine, applicable for transfer of liquid to the patient and from him. SUBSTANCE: the connector has a primary duct, whose upper section in the direction of flow communicates with the primary liquid source, and the lower section in the direction of flow communicates with the patient. The connector has also a secondary duct communicating with the primary duct. Besides, provision is made for a connector with a hollow elastic valve so positioned that primary liquid passes through it when it is in an undistorted state. The valve has a fastened tongue projecting into the secondary duct so that the medical instrument introduced un the secondary duct exerts pressure on the tongue and distorts the valve through it, as a result, the flow of the primary liquid through the valve is shut off, and at the same time the passage for the flow of liquid from the mentioned instrument to the patient and for liquid from the patient and for liquid from the patient to the mentioned instrument gets open. EFFECT: enhanced convenience in use. 18 cl, 14 dwg
