What is this part????????

[Melter18]

Could anyone tell me what this part is called? It’s leaking oil and now air and is making my exhaust blow out black smoke. It looks like a inlet to the engine. The seal as gone. Any help would be much appreciated

 

[Melter18]

Mercedes c220d sport 2007 (57) plate

 

[Wighty]

Is it not the fuel pipe above it leaking ?

 

[mioba]

Is it not the fuel pipe above it leaking ?

was my first thought and thats whats actually creating the mess.... but maybe it was taken off prior for some diagnostics...