A connection system for components through which a fluid is passed comprises an actuator and a main housing. The actuator has a cylindrical portion with an outer face. A handgrip is arranged at a first end of the cylindrical portion. In the region of a second end the cylindrical portion has a cavity, which is open towards the second end, and in the region of the second end there are arranged at least two gate-like passage openings for fluid connection. The main housing has a main body and at least two fluid passages arranged laterally on the main body. The main body has a cavity with an open first end, a base in the region of a closed second end, and at least two laterally arranged openings. A substantially cylindrical protrusion is arranged on the base of the main body and a peripheral shaping is arranged in the region of the second end of the actuator, which shaping at least partially surrounds the protrusion and thus forms a counter bearing for the second end of the actuator.