ITEM NAME:Sodastream Cylinder Adapter Converter To W21.8 Aquarium Fish or Homebrew Be L6E1 Sodastream Cylinder Adapter Converter To W21.8 Aquarium Fish or Homebrew Be L6E1 Robust design and manufacturing will last a lifetime. Makes portability easy from homebrew. Great for events so you do not have to haul around a bigger tank because of the small size of CO2 tanks, this one is not recommended for carbonation, but great for royalty. Easy installation SodaStream Cylinder Adapter Converter to W21.8 Aquarium Aquarium CO2 Regulator This is Perfect unit that attach a sodastream cylinder to your existing Aquarium Fish CO2 tank regulator or homebrew beer barrel regulator. Converts SodaStream threads to DIN477 / JIS m22-14 / BS 341 no. 8 / W21.8-14 /. 860 inch x 1/14 (covers UK, Europe and Asia) . Internal thread: SodaStream thread External thread: W21.8 Please note: it can not work on AU and NZ sodastream bottle Colour:SILVER Material:Metal Size:about 3cm Package Contents: 1 * SodaStream Cylinder Adapter