cowl induction door question

[fleming23]

I don't see the check valve in that kit, fyi. This is what is inserted in the middle of the vacuum line so that once the hood flapper opens it slowly closes rather than snapping back shut when you lift off the pedal.

On that topic, it seems most of the aftermarket check valves do not work very well anyway. I know the one I received from Ground Up does not keep my hood flapper open nearly as long as the factory style intended.