Need a reliable and easy-to-find alternate air source (your 'octopus') for your scuba diving regulator setup? The Aqua Lung Legend Octopus is a top-tier choice. It's designed to perfectly match the Legend regulator first stage, but it'll work great with other balanced first stages too. The whole thing is built for performance and safety. The most noticeable feature is the bright yellow color – the purge cover, accents, and the 39-inch braided hose are all high-visibility yellow. This makes it super easy for your buddy to spot in an emergency. It's pneumatically balanced, which means it breathes easily at any depth. It has a venturi switch to prevent free-flow when you're not using it, and the exhaust tee is redesigned to direct bubbles away from your face. For cold water divers, it includes an efficient heat exchanger around the valve to help prevent freezing. It's also nitrox compatible up to 40% oxygen right out of the box. If you're putting together a pro-level scuba kit or just want a super dependable backup second stage, the Legend Octopus is an excellent pick that combines great breathing performance with crucial safety features.