This portable mini scuba tank is designed for short-term underwater exploration, dive training, and emergency air supply. Each refillable tank is equipped with a pressure gauge and a breathing mouthpiece. Lightweight and easy to carry, it supports multiple breathing cycles and is suitable for snorkeling, leisure diving, boat backup use, and pool conditions. | Vevor | | Mini Scuba Tank, 0.5L Portable Diving Tank for Underwater Breathing, Reusable Lung Diving Cylinder up to 10 Minutes Dive | Green | Best Buy