When the European Standard for oxygen connection came into force in August 2008, it was supposed to help make diving safer. Cylinders containing a mix greater than 22% were meant to have a different thread to help prompt the diver to consider what they were breathing. Instead it has been a source of major frustration, and where possible ignored by the community.
But what do you do when you want to get a tank filled that has an M26 valve fitted and the air station only has M25 whips? Alternatively if you have a M26 first stage and need to dive a M25 valved tank, what is the solution?
AP Diving has a range of relevant adaptors that you can simply screw in place.