Hi everyone, I’m in the midst of some under dash work including a heater core replacement and refreshment of the boxes. 

There’s this large vacuum line coming off of the check valve by the steering column. Service manual doesn’t show where this one goes - unless I’m misreading. 

Pictures attached - any ideas?

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One of those big hoses go to the NSS and to the parking brake vacuum canister.

I got it!

The hose coming out of the right side of the valve seems to be the supply line for vacuum. It goes up to the bulkhead on the firewall. The nib is circled in red and also pictured is the backside of said bulkhead, from the engine bay, showing the other section of the vacuum line.

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