Extend Atlant Siphon sewage hose

Hello,

on Saturday my Ikea kitchen was finally installed. Everything went great, but it turned out that the sink is too far from the water connection to be connected as is. Extending the water supply was no problem at all, but I don’t know how to extend the drain. (In case I wasn’t clear: I mean the gray pipe) A normal HT pipe from the hardware store doesn’t fit or I’m too stupid to attach it properly. Does anyone have experience with this or can help me in any other way? I don’t know what to do.

The Atlant siphon can be inserted into an HT pipe. If there is one in the wall, then you can also extend the pipe from the wall. Have you tried this unsuccessfully?