Cistern for garden irrigation - Which pump?

How do you seal the cistern opening through which I will run a 32mm PE pipe and power cable? Are there any suitable covers for that? Also, the question whether it would make sense to lay additional KG pipe through which I then run the water-carrying pipe to facilitate easier replacement?

I have to ask one more question: I would like to have a pressure switch in the pump. But I also wanted to install a drainage valve. That could basically become a vicious circle if it drains, the pump keeps turning on again?!?!. Or is no drainage needed? Maybe someone also has an answer to my question from the previous post... Thank you and regards

I have to ask another question: I would like to have a pressure switch in the pump. But I also wanted to install a drainage valve. That could basically become a vicious circle if drained, the pump would keep starting up?!?!. Or is no drainage needed? Maybe someone also has an answer to my question from the previous post...
Thanks and regards

…You need drainage as frost protection in the piping system. Simply equip the pump with a switch or just unplug it if you want to drain the water. :) You will probably only drain the pipes and the controller once a year.

From when does the valve open? It is of course only intended to keep the system empty in winter.

When does the valve open? Of course, it is only intended to empty the system in winter.

For Gardena it is 0.2 bar. The valve is located in front of the valves. The pressure remains maintained in the system and only drops to the pump's switch-on pressure. This is usually around 1.3 bar.

… you can also do without a valve, open the pipe in the cistern and empty the system with a foot pump or the compressor. You just shouldn’t forget it.