Professional Design for scuba diving tanks This Diving Tank Refill Adapter is built to transfer air efficiently from large to small bottles. It includes a connecting hose with an interface of 0.8 cm (0.31 in) for reliable compatibility during refills. Material for durability Made entirely from 6061 aviation aluminum, the adapter offers strong hardness and durable performance under pressure, with waterproof characteristics suitable for marine use. Easy to Read MPa gauge The precision dial on the Diving Air Cylinder Refill Adapter provides MPa pressure values at a glance, enabling quick, accurate readings during refills. Luminous gauge for low light visibility The luminous gauge stays clearly visible underwater up to 80 meters, ensuring reliable pressure readings in dim or night conditions. Why you need it Enables fast and controlled air transfer from a larger tank to smaller cylinders, helping you manage air supplies onsite without multiple devices. Reduces the risk of overfilling or underfilling with a clear, easy to read pressure gauge. Built to endure pressure and challenging environments, giving you a dependable refill solution. What makes it stand out Allmetal 6061 aviation aluminum construction for durability and resistance to pressure. Integrated luminous gauge for visibility underwater, improving safety and accuracy in low light. Simple, direct design with a standard 0.8 cm (0.31 in) interface for straightforward setup. Use scenarios On a dive boat or remote location, refill a smaller dive cylinder or pony bottle from a larger air tank to extend your dive time. Prepare cylinders for night dives or lowvisibility operations where clear gauge readings are essential. Perform maintenance or field refills in environments where accurate, easy to read MPa measurements are required. Specifications at a glance Interface: 0.8 cm (0.31 in) Material: 6061 aviation aluminum Gauge: MPa with easytoread precision dial Visibility: Luminous gauge readable underwater up to 80 meters Purpose: Refills from large scuba tanks to small bottles for dive equipment