Feature:1. Aluminum Alloy Material: This diving oxygen cylinder refill adapter is made of high quality aluminium alloy material, which is rust proof and wear resistant.2. Lightweight: Aluminum alloy driving tank refill adapter is lightweight, easy to carry and use. Simple operation, make diving easy, no need to carry big diving tank.3. Easy to Install and Disassemble: Aluminum alloy diving equipment is used to fill small oxygen cylinders with oxygen in large driving tank. Portable and practical.4. Suitable Size: This diving oxygen cylinder refill adapter is small in size of 134x64x24mm / 5.3x2.5x0.9in. Small size, more convenient to carry when diving, convenient and practical.5. Essential Accessory for Diving: Very suitable for underwater sports enthusiasts, it is a must have item for diving, allowing you to have a better diving experience.Specification:Item Type: Diving Tank Refill AdapterProduct Color: BlackMaterial: Aluminum alloyGross Weight: 268g / 9.5ozProduct Size: 134x64x24mm / 5.3x2.5x0.9in Package List:1 x Diving Tank Refill AdapterNote:1. Please allow 1‑3mm error due to manual measurement. Thanks!2. The monitor calibration is inconsistent, the color of the item shown in the photo may be slightly different from the actual object.