Abstract: A modular control block for applications in the field of analytical procedures has a plurality of individual elements (2, 5, 15, 19, 20), each having at least one channel for the inflow and for the outflow of fluids, which can be connected to each other by means of suitable connection points. In order to reduce the manufacturing costs of the control block, all individual elements (2, 5, 15, 19, 20) are embodied with the same outer contour and may be arranged in-line or staggered, with different function modes of the control block being achieved by either an in-line or a staggered arrangement of the individual elements (2, 5, 15, 19, 20), or by any desired combination of individual elements (2, 5, 15, 19, 20) arranged in-line and/or staggered.