Vacuum Reservoir Plumbing Help Needed

Easy one

Cutoff black hose goes goes to bottom of reservoir
Green striped hose goes to hot water shut off valve in heater hose.
Top of reservoir is a bigger hose that goes to intake manifold for engine vacuum.


Thanks for your response Yellowdartdave. Unfortunately, my intake manifold doesn't have any vacuum ports! Can I use any other vacuum source? And if so which one?