Specifications: This is an ideal product that attach a cylinder to your existing CO2 tank regulator or homebrew beer keg regulator. Made of high quality aluminum material, this convert adapter is practical and provides long service time. It makes portability of homebrew beer more easily and also provide an inexpensive way to make soda at home. Item Name: Cylinder Convert Adapter Material: Aluminum Inlet Female Thread: TR21-4 Thread Outlet Male Thread: W21.8 Features: Durable, Portable, Easy to Use Length: 2.7cm, Width: 2cm, Height: 1.5cm(Approx.) Notes: Be kindly noted this product is not suitable for sodastream cylinder in Australia and New Zealand. Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Cylinder Convert Adapter