These water pipe adapters are 14mm male. They also have a passthrough valve, with a small glass stopper. When the stopper is in place, the WPA is airtight. 

Very useful WPA for using your compatible device with any glass bubbler that has a 14mm female connection point.

The user only needs to remove the glass stopper, instead of lifting the device out of the bubbler to release the vapor.

View all our 14mm Glass bubblers here: 14mm Bubblers