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