Portable Size: This scuba diving tank refill adapter set has a compact design and is easy to store. It fits conveniently into tool bags for transport. Easy to Install: Installation and removal are straightforward and require no additional tools. The design enables quick tank filling, suitable for outdoor use. Compatibility: Features an 8 mm fill valve size compatible with most standard scuba valves. Material: Constructed from aluminum alloy; the hose exterior is reinforced with steel wire. Pressure Gauge & Hose: Includes a pressure gauge and hose for real-time pressure monitoring. Thread: 8 mm Working Pressure: 30 MPa Hose Length: Approximately 500 mm Color: Black Material: Metal Package Contents: 1 x Scuba Adapter with Hose Note: Color may vary slightly due to lighting and screen differences. Measurement tolerance is ±1–3 cm.