Cap for DN50 pipe with adjustable cable outlet

This is a cap to close the end of a DN50 HT pipe (pvc pipe, with diameter of 50mm).
The cap features a cable outlet that can be adjusted for the diameter of the cable (or for getting a plug through the hole).
I am using this to run cables through my garden in DN50 pipes and close the end of the pipes to keep small animals like insects from entering the pipe.