Read more Enjoying the diving trip Self-reliant Smaco Scuba Diving Cylinder is not limited to shallow diving. For self-rescue, you simply switch to your pony bottle and you are completely self-sufficient, as you make your ascent to the surface. A pony bottle scuba tank is the only true redundant breathing mechanism you can completely rely on. Multiple Uses One of the great things about Smaco Scuba Dive Cylinder is that they are not limited to a specific area of your diving. Smaco pony bottle can be used more than for just for shallow diving. If you already have your main unit and are looking for a self-rescue emergency backup, Smaco diving equipment is a good choice. Reliable gas cylinders 1.The entire body made of aerospace aluminium alloys better resists internal corrosion and stands up well to damage. 2.Smaco cylinders are relatively small, yet very strong containers that hold large volumes of compressed gas. 3.Make sure you get prepared on your next dive with one of our air tanks made from high-strength aluminium alloys. 1. Washed and cast 2.Sandblasting 3.Multi-process spraying Professional Scuba Cylinders Integral Release Valve + SRCPEG constant pressure device The integrated release valve can release the compressed air through the pressure difference during inhalation, the released air will be decompressed by the SRCPEG constant pressure device and converted into a constant pressure gas, which will be more conducive to breath. Different from the S300 scuba tank, the S300Pro added a constant pressure device, and at the same time, the tank capacity has also become 0.7L, these upgrades make the S300Pro series more suitable for short-term diving. 1. 10-13 minutes breathing time 2. 30 ft maximum diving depth for diving practice 3. 100 ft maimum diving depath for emergency air source 4. Constant pressure output for smoother breathing 5. can be taken on the plane after disassemble the valve and tank body Read more Read more Warning: 1. This product is suitable for recreational diving within 30ft. Do not attempt to use it as an air supply in deep water. 2. This product can be used as a backup air source for recreational diving within 100ft. 3. This product is suitable for waters above 50 ℉. 4.Inflate the product before use and check for damage or leakage. Never use items that are damaged, leaking, or showing signs of performance error. 5. The maximum filling pressure of this product is 3000 PSI or 200bar, And can only fill the compressed air that the human body breathes. Gases with an oxygen content greater than 40% cannot be used. 6. Keep the product in a cool, dry place away from direct sunlight. Do not store in a car trunk or high temperature, or put it in the fire. 7. After filling the air, the pressure must be released first. 8. When the gauge pointer reaches the red area, please rise to the surface, inflate again to use. 9.Emergency equipment must be used in an emergency. This product does not provide protection in the event of danger. 10. When using for the first time, please practice in shallow water.