vacuum hose on S10 blazer transfer case?

NY1Krr

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The 4wd on my 1988 S10 blazer is not engaging and I suspect the cause to be the vacuum hose. The truck is at my summer cabin 3 hours away so I cant crawl under it to check.
Can someone tell me what size the vacuum hose is? The length would also be very helpful. I'd like to swing by napa or pep boys to get the hose and change it this weekend but I cant seem to find out what size it is.
Thanks for the help!
 
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