Carbonator Cylinder Tank Refill Adapter Connector Filling Station Adapter Adapter Specifications: The cylinder refill adapter is made of metal material to make sure it is durable and sturdy to use. With the features of TR21.4 thread, the adapter is easy to install and use. There is bleed hole on side of the adaptor for reducing the risk of rest air/CO2. This product provides with different standard of the adapter for you to choose, which is able to meet your different needs. Item Name: Cylinder Refill Adapter Material: Aluminum Alloy Thread: TR21.4 Features: Durable, Portable, Easy to Use Adapter Size: 10cm x 5cm x 5cm/3.93" x 1.96" x 1.96" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Style A Package Includes: 1 x Cylinder Refill Adapter with One Bleed Hole,2X washer Style B Package Includes: 1 x Cylinder Refill Adapter with Two Bleed Holes,2X washer Style C Package Includes: 1 x Cylinder Refill Adapter with One Bleed Hole 1 x Male Connector 2X washer Style D Package Includes: 1 x Cylinder Refill Adapter with Two Bleed Holes 1 x Male Connector 1 x 1500psi Gauge 2X washer Tank gas adapter connector Air Tools compressor accessories pistola de para compresor and hose for tool grinder set nozzle air-compressor pneumatic mechanics pressure Tank gas adapter connector C Committed to creating a comfortable and warm home environment for families so that every family member feels happy and satisfied.