Air hose add on

Joined
Oct 16, 2025
Points
3
Hi all!

I just replaced my Vanos line and noticed that the air hose coming from the air filter box to the engine is looking a bit dry. Because of this I want to replace this but when I look for online replacements I see most are missing a connection found on my current one. I have circled the connection in the attached image. This runs into a box under the air filter. Does this serve an further purpose or would I ben fine with a replacement that does not have this piece?
 

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