What is this brass component on my UFH distribution board

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[GALLERY=media, 105419]IMG_20201025_164001 by AndyCW62 posted 29 Oct 2020 at 9:37 AM[/GALLERY]

This brass component is leaking. I can't find anything that looks like it online to try to get a replacement. The top bit looks like an automatic air vent, but the body?
Any help identifying this would be appreciated!
 
Thanks. You could be right Or just a deaerator? I just found Caleffi Discal deaerators that look a bit like this.
 
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