The SMACO Diving Oxygen Tank With Pump features a high-quality tank, consisting of not one or two but four different layers (an antioxidant coating, aviation aluminum, a protective layer and antioxidant paint). Also included in the set is a pump and a respirator bag. The tank is neon green and has a capacity of 500ml. It takes just seven to 10 minutes to pump the tank to full capacity. The maximum time you can spend underwater is 10 minutes. So if you’re keen for some quick dives, this is the SMACO Scuba Diving Oxygen Tank Set for you.