Charger 1973 fuel tank cap, vented or non-vented (Stant 10571)

Hi guys,

I have Charger 1973 and Stant 10571 fuel gas cap. Does somebody know, is this vented or non-vented cap?

I found this on Stant web site: http://ww2.stant.com/modules/partLoc...m.cfm?id=10571

There is "Regular Locking Fuel Cap" as you see, so it should be non-vented, right?

This is my gas cap.


There is a small hole as you can see, and I can suck in but can't blow out air. Therefore, this should be vented cap or I am wrong?

Thanks in advance.