Size Vacuum line for Secondary Air Pump
 

I got a code for my secondary air pump and upon inspecting it I noticed that the hose that comes from it and leads up is deteriorating. The white lettering on it is majority faded so if anyone can tell me the size for it that would be greatly appreciated. I have a 2001 Blazer.
I’m hoping to pick up the hose on my way from work to give myself enough time to replace it in the morning after before I have to head into work again.