Flexible extension spout for attachment to the mixing spout of injection mortars, for use with chemical anchor holes with a drilling depth from 125mm to 625mm. Can be easily cut to size if required. The extended mixing nozzle makes it possible to fill the borehole from below without air entrapment, which is of great importance for a reliable fastening. A float can also be clicked into the end of the extension spout, which is pushed upwards by the injected mortar so that air entrapment can be completely prevented