What's the difference between the SCORKL and the SCORKL Pro?Updated a year ago

The only difference between the SCORKL and the SCORKL PRO is the size and volume of the cylinder. The SCORKL PRO is approximately four centimetres longer and holds approximately 12 additional surface breaths. Both cylinders have the same diameter, fill to a pressure of 200 bar (3,000psi) and both connect to the same regulator.