Features：
1 It won't need any adaptor connect.
2 Used for Soda Water bottle with thread TR 21* 4 EU Standard
3 These stainless steel barb outlets replace the standard M8 threaded brass outlets that come as standard normally.
4 They allow you to connect a piece of 8mm gas line directly to the regulator rather than using the swivel adapter and barb outlet 
5 The Premium Regulated Charger is very compact but is just large enough to house a very small regulator. 

Specification: 
 Material: Aluminum Body & Copper Valve
 Feature: Working with Compressed Air
 Working Pressure: 15MPa/2200psi
 Test Pressure: 25MPa
 Capacity: 0.6L
 Size: 36cm*6cm 
 Valve: Sodastream TR21-4
 Simply refill your carbonic acid by yourself.
 Cost-effective refilling at home in any time. 
 
Mini Co2 Regulator Specification: 
 5/16" Barb. (8mm) 
 Range:0-90 PSI
 European Standard: TR21*4 thread.

Package included:
1*High Pressure Co2 Cylinder  
1*Co2 Regulator 

Pictures: