Features:_x000D_ _x000D_ Made of high quality aluminium alloy, anti-rust and durable. _x000D_ Fill small oxygen cylinder with oxygen from the large scuba. _x000D_ Simple to operate, making diving become easy, no need to carry large scuba. _x000D_ Small size and lightweight, easy to carry and use. _x000D_ Portable and practical, essential accessory for diving. _x000D_ _x000D_ Specification:_x000D_ Material: Aluminium Alloy_x000D_ Color: Shown as pictures_x000D_ Size: Approx. 13.5 * 6.2 * 2cm / 5.31 * 2.44 * 0.79in_x000D_ Weight: Approx. 250g_x000D_ _x000D_ Package List:_x000D_ 1 * Scuba Tank Refill Adapter 1Made of high quality aluminium alloy, anti-rust and durable. 2Fill small oxygen cylinder with oxygen from the large scuba. 3Simple to operate, making diving become easy, no need to carry large scuba. 4Small size and lightweight, easy to carry and use. 5Portable and practical, essential accessory for diving.