quick hose question

[Fastway135]

what size is this hose?

 

[Supraboostin]

are you pointing at the water hose that goes to the turbo or the vacuum?

 

[NJsupraA70]

3/8 I.D works fine.

 

[Fastway135]

are you pointing at the water hose that goes to the turbo or the vacuum?

The fat one that has coolant going through it. the one the arrow is directly touching. I put a red line going through it in this pic.