Feature:1. Bottle head interface is suitable for most of the bottle head valves on the market. Small size, light weight, easy to carry and use.2. The adapter is a tool to guide air from a large bottle to a small bottle. It is easy to operate, no need to carry a large scuba, making diving easy.3. 8mm inflatable interface adopts ball type lock design, durable and easy to operate.4. When the gas is full, close the bottle head valve and unscrew the pressure relief, the knob to release excess gas, then take down the adapter.5. The fixed knob adopts spiral knob design, which makes the operation simpler and more comfortable.Specification:Item Type: Scuba Adapter for Diving EquipmentMaterial: Aviation Aluminum 6061Colors: BlackInterface Female Head Size: 8 mm/0.3in Quick ConnectorWeight: Approx. 265g/9.3oz.Package List:1 x Scuba Adapter