Power cable too narrow for multi-utility

Get the appropriate gasket from the manufacturer. These multi-utility house entries are so damn expensive because they include guarantees for tightness and not because the plastic is mixed with gold. I wouldn't mess around with it unless it is approved by the manufacturer. The part is simply too expensive for that.

I have already looked; there doesn’t seem to be an alternative.

I explained the situation to my site manager today, let's see what he says afterwards ...

So,

I called Doyma and they are now sending the sealing element XLWL. Several cable solutions are possible there, including 23-40 mm, which fits perfectly with 23 mm on my cable.

Thanks for all the advice

the cable must have a diameter of at least 26mm, but my 5x16mm2 is only 24mm

What do you see against simply thickening the cable accordingly in the relevant area?

The gasket is paid for by my house builder, so I don't need to "mess around" when I can get a 100% fitting part for free