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Some of the catch can lines shouldn't mix or you may ruin the vac or whatever is running through it correctly. I realize that vac is vac, but its not meant to be 'merged' like that after the source... I dunno.
I don't comprehend how you don't have a vac source....
hes venting the POSITIVE pressure from the crank case. AFAIK its not getting fed back to the intake.