Expansion Tank Hose Size

[velozi]

Do not have the car with me and planning to buy a replacement on my way home.

Any idea of the internal size of this long, thin hose? Any known replacement parts at a local parts store?

[htchevyii]

It's either 5/16 or 3/8, I like to use the clear vinyl so I can tell if it's bled properly. The biggest problem is it's a larger size where it attaches to the tank, so you have to force it on or splice on a larger hose.