Benefits at a glance Clear and easy to read dial provides accurate pressure readings at a glance, reducing guesswork and helping ensure efficient tank refilling. 8 mm interface (0.31 inch) supports air transfer from large to small scuba tanks, offering wide compatibility with most diving cylinders. PSI pressure gauge, built with stainless steel, delivers waterproof protection and reliable performance for longterm durability. Made from strength 6061 aviation grade aluminum, the adapter is lightweight while remaining resistant to impact and wear. What this adapter does Transfers air from a larger cylinder to a smaller one for quick, onsite refills. Provides a precise pressure reading during refilling to help prevent overfill and underfill. Built to endure frequent use in boat, , or field environments thanks to durable materials and construction. Key features and specifications Interface size: 8 mm (0.31 inch); standard interface designed for broad compatibility with most diving cylinders. Pressure gauge: PSI gauge made entirely of stainless steel, offering waterproof performance and dependable durability. Material: strength 6061 aviation grade aluminum; lightweight with strong resistance to impact and wear. Use scenarios On a dive boat or at a dive , transfer air from a larger primary tank to a smaller backup cylinder, using the gauge to monitor fill level and finish with a safe, accurate pressurization. In maintenance or preparation areas, off smaller cylinders from a larger air source to ensure tanks are ready for planned dives or training sessions. Field service or travel scenarios where quick, reliable refills are needed between sessions, with a durable aluminum construction designed to withstand rugged conditions.