Worked surprisingly well!!!
Yea I wouldn’t really consider this a cap.  It’s more of an adapter.  Works great on my female oil rig.  I think it’s a little pricey but who cares it’s pretty quality product.  I don’t see how you could be disappointed with this. I needed something to cool down the vape pen for my lungs.  This worked as the perfect adapter for my rig.
Rating: 5 stars