For the 2N pipe connector, the pipe is placed against the inner edge of the connector and a sealing ring seals off the connection. A cutting ring wedges into the flexible tube or pipe as far as the knurled nut is screwed onto the connector body, thereby fixing the connection in place. This creates a friction-locked and tight pipe connection that can be released at any time, that eliminates dead volume in the design concept and also has no effect on the flow. The inside diameter of the connector does not correspond to the inside diameter of the pipe.