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I assume when you say the ‘need’ is leaking you are referring to the white air valve that Red Sea use in their ATOs. No, it is not normal for this to leak. You can just replace it with any right angle air line valve.
The purpose of this valve is just to allow you to shut off the water supply to the float valve in the sump, e.g. if you want to take the float valve out to clean it.
From the bottom picture your issue may simply be that you opened the valve up too far and it is leaking from the screw thread. If so just screw it back down until it stops leaking, but is still allowing a flow of water through the ATO line.

