This cap is threaded for use with all mini keg sizes.
This is the replacement part for the cap that comes with the Basic Tap Kit.
This cap can be converted for use with any 1/8" NPT threaded adaptor, like the 90° 1/4" barb pictured below. This will allow customization options like this cooler setup. This will requirepermanently removing M8 thread and using a 1/8" NPT machinist tap.