Thread: Is this a vacuum leak from transmission/transfer case breather hose?

Discovery 2a, 4L V8 from 2003

I connected my DIY smoke machine to the air intake, pumped smoke into it, and in addition to a few other vacuum leaks, I was seeing the smoke come out from this breather hose:

https://youtube.com/shorts/YmvNL-QD2Xs

I'm not sure if it's for the trans or the transfer case?

Is this normal that smoke can escape from there via the throttle body? I didn't know there was a connection.

Car had been sitting for 24h.

Found out this is the charcoal canister breather hose