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 TM2 with any glass bubbler that has a 14mm female connection point.

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