Hollis makes a O2 reg. as well as Apeks XTX 40 I'm sure that there are more. I have the Calypso Oxygen.
Most Oxygen regs are very simple as they only have to breathe in shallow depths. 50%-70'
80% 30' 100% 20' maintaining the recommended ppo2
Most Oxygen regs are very simple as they only have to breathe in shallow depths. 50%-70'
80% 30' 100% 20' maintaining the recommended ppo2