So I found out I had a leak of coolant, and upon further investigation I have found the trouble maker. Yet I can't order a new part because I don't know the name of it. I was hoping one of you guys knew what this piece was called. (see attached images)

My main guess is that the o-ring inside the plastic piece died on me, it's very loose and has quite a lot of wiggle room.

Thanks for your time anyhow!

Cheers!

The part number is readily available in your second photo 1J0 122 291F

Just now, Pete_Ex-Wino said:

The part number is readily available in your second photo 1J0 122 291F

Yes. My apologies, I only realized that after I had made the post. I have also found the part itself already. 

Anyhow, thank you still!

No problem. 

2 hours ago, Niclas_FF said:

I can't order a new part because I don't know the name of it.

In English, I'd normally call a part like that an "elbow".

But VAG call it a "Quick Acting Coupling"