Sealing insert for a corrugated-pipe screw fastening system, corrugated-pipe screw fastening system, and method for fitting a corrugated pipe

A sealing insert for a corrugated-pipe screw fastening system, the sealing insert comprising:

• a cutout for receiving a corrugated pipe;
• first and second end faces;
• a first external wall portion having a first outer diameter;
• and
• a second external wall portion having a second outer diameter;
• wherein:
• an internal wall delimiting the cutout comprises at least one circumferential rib that extends in a circumferential direction of the longitudinal axis about at least a portion of a circumference of the inner wall;
• the first external wall portion is adjacent to the first end face and extends along a longitudinal axis of the sealing insert up to the second external wall portion;
• the second external wall portion is adjacent to the second end face and extends along the longitudinal axis up to the first external wall portion;
• the first outer diameter is larger than the second outer diameter;
• the first and second external wall portions are each configured to be cylindrical;
• an anti-rotation structure is arranged on an outer shell of the sealing insert;
• and
• the anti-rotation structure is associated with the second external wall portion.