Mangrove Jack's Line Cleaning & Counter Pressure Bottle Filler Cap
This Pressure Filler Cap by Mangrove Jack's makes transferring beer to bottles an easy process.
If you keg your beer and want a few bottles to drink or your friends to try, this is the perfect gadget.
It can be used to carbonate your beer or water or used to clean your beer lines.
This fits both the black/liquid and grey/gas ball lock disconnects and has a barb tail that fits 6 mm tubing if you wish to use this when filling bottles.
For more information check out the video of the cap here.