Connector for plastic tubes

A connector for cylindrical plastic tubes, said connector comprising:

• a metallic inner sleeve having an outer diameter that is greater than an inner diameter of the plastic tubes to be connected;
• said inner sleeve having a free end and a securing flange positioned opposite said free end;
• a metallic sliding sleeve for sliding onto a section of the plastic tube, the plastic tube having inserted therein said inner sleeve;
• said inner sleeve having an outer surface with at least one circumferential rib of a substantially rectangular cross-section;
• said sliding sleeve having a leading end and a rearward end in a direction of sliding onto said section;
• said sliding sleeve having an inner surface that, beginning at said leading end and ending at said rearward end, has sequentially arranged thereat:
• a first conically narrowing zone, a second conically narrowing zone, a cylindrical zone, a third conically narrowing zone, and a cylindrical zone;
• and
• wherein between said first and said second conically narrowing zone a transition zone is located, said transition zone being sawtooth-shaped in cross-section.