On 10/11/2020 17:32, Tricky Dicky wrote:
No need to disconnect the Ethernet cable. A shrouded RJ45 plug will easily pass through 20mm trunking with room to spare. As the OP needs to pass 4 cables all he needs to do is tape the cables so that the plugs are one behind the other and they should pull through easily.

Anyway, use 25mm. Why struggle?

Bill