4L

The 4L diving gas cylinder is suitable for shallow water areas, short periods of time, and high maneuverability underwater exploration (such as photography and simple observation), but it requires strict planning of gas volume and control of depth.

Depth range: 5-15 meters (optimal applicable depth).
Time estimation: Under calm breathing conditions (approximately 15-20 liters/minute gas consumption), a 4L gas cylinder (800 liters of air) can support approximately 15-30 minutes of exploration time.
Typical uses: underwater photography, coral reef observation, short-term investigation of small sunken ships or rock areas.  

 If you want to go diving in the sea without professional equipment, what should you do? With a small diving bottle, beginners can also dive and experience the charm of the sea.    

The 4-liter diving gas cylinder strikes a balance between portability and storage capacity, making it suitable for short-term diving, backup, or special operational needs.