Fresh Air vent plugs….

[Mad Mikey]

Does anyone have any fresh air vent plugs or know where I can purchase  any for the front fresh air vents on the sides of the Mooney M20J 1978 ? 
I have seen them on planes before, but can’t find any.   Thanks 

[N9405V]

I’ve used blue painters tape before.


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[N201MKTurbo]

Get some polyethylene foam cut some up.