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The interfacing of a on-chip microreactor with the external world is investigated from the microfluidic point of view. A solution for coupling of input and output capillaries perpendicular on the micro-reactor plane is presented. The micro-reactor consists of a planar array of 7 x 7 metallic electrodes covered by a borofloat® glass reservoir provided with openings for the input and output capillaries having an internal diameter in the range of 220 – 500 μm on a chip of 12 x 13 mm. The reservoir has a volume of 60 μl and was manufactured by means of wet etching using a lithographically patterned Au/Cr mask. The capillaries are vertically inserted in the reservoir’s openings and leaned by means of silicone rings with cylindrical and respectively conical shape, the larger of them being glued with a silicone based adhesive. The key process steps were: cutting the rings with appropriate shape, size and contact surface; aligning and gluing the fixed rings. A functional trail of the obtained microreactor has been performed in an electrochemical set-up that allowed a continuous flow of the analyte of 10 μl / min.