Quick question: is it okay to connect my top radiator on the 3rd outlet?

My top radiator has 2 connectors on the one side and one extra single connector on the other side.

Can I use the 3rd one just like I could use the other ones?

[pictures ](https://imgur.com/a/w5mDO8e)

Thanks for your Advice, I tried googling it, and browsed this sub, but I couldn’t get a sufficient answer, plus no one seems to use it.