Portable Size: This scuba diving tank refill adapter set is compact and easy to store, allowing you to carry it in your tool bag. Easy to Install: Installation and removal are convenient and require no additional tools. The design enables quick tank filling, ideal for outdoor use. Compatibility: The 8mm fill valve is compatible with most standard scuba valves and offers wide application. Preferred Material: The adapter is made of aluminum alloy, and the hose is reinforced with steel wire for durability. Pressure Gauge & Hoses: Equipped with a pressure gauge and hose to monitor pressure changes effectively. Thread: 8mm Working Pressure: 30MPA Hose Length: Approximately 500mm Color: Black Material: Metal Package Contents: 1 x Scuba Adapter with Hose Note: This package includes only the items listed above. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement error is +/- 1-3cm.