Syringe adapter (1； 19； 24； 25； 29) for joining a dosing syringe (2) with a container (3) for housing a liquid, - with a liquid discharge channel (6a) for the creation of a flow joint between an interior of the container (3) and an interior of the dosing syringe (2), - with at least one ventilation channel (12； 12, 13) for the creation of an air connection between the inside of the container (3) and a container environment (14), - a check valve (15 to 17； 15, 16 being arranged in at least one of the channels (6a, 12； 6a, 12, 13)) ； 26) that in an open position it allows a passage of medium and in a closed position it closes the channel (6a, 12； 6a, 12, 13), - being made, on the one hand, a basic adapter body and, on the other side, the at least one check valve (15 to 17； 26) at least by sections of different plastic materials, - the at least one check valve (15； 26) being made with or drip valve disposed in the liquid discharge channel (6a) that opens when a negative pressure is created at one end of the liquid discharge channel (6a) on the side of the syringe and, otherwise, closes, - being made at least one other check valve as a vent valve (16, 17； 16； 26) arranged in the ventilation channel (12； 13, 13) that opens when creating a negative pressure at one end of the ventilation channel (12； 12, 13) on the side of the container and, otherwise, closes.Adaptador de jeringa (1； 19； 24； 25； 29) para la unión de una jeringa de dosificación (2) con un recipiente (3) para el alojamiento de un líquido, - con un canal de descarga de líquido (6a) para la creación de una unión de flujo entre un interior del recipiente (3) y un interior de la jeringa de dosificación (2), - con al menos un canal de ventilación (12； 12, 13) para la creación de una conexión de aire entre el interior del recipiente (3) y un entorno de recipiente (14), - estando dispuesto en al menos uno de los canales (6a, 12； 6a, 12, 13) una válvula de retención (15 a 17； 15, 16； 26) que en una posición abierta
