The OP20 Second the first in a series of Ocean Pro’s robust, reliable and lightweight designs, offering the best value for money of any regulators in their class. Designed light, to reduce any signs of jaw fatigue, and featuring a demand valve design giving a smooth easy breathing performance every breath of the way. With the benefit of pre positioned front cover ring holes, ensure ease removal of cover at time of service and coming Nitrox ready out of the box, there is no need to look elsewhere.