What size? Vacuum Line

[PFC_CiarlilloM]

Okay, so I ordered RRE's Larson Silicone Hose Kit. I am in the process of doing a BLT and replacing all vacuum lines. I came across a vacuum hose where it seems that its between 4mm and 6mm. Can anyone tell me which size I should replace it with?

*Attached picture for location*

Thanks,
Mike

It appears to be 6mm because the hose seems bigger than the 4mm going into the throttle body/manifold. When I used the 6mm though there was a little bit of a leak.

 

[TSI_1G_90]

6 and a hose clamp.