The AIR I was designed as a less complex successor of the Pilot. It was the first 2nd stage housing that wasn´t made of metal (material similar to AIR II first gen.). The valve was a new construction and remained similar until the D 400. Due to its design this valve offers an enormous potential of improvement for the breathing effort that hasn´t been exhausted until the end.
The optical design of this regulator - which was the topmodel these days - was completely different to common regs and remains a little to star-wars - this reg got its nickname "darth vader".
This reg had like the pilot the possibility to connect the first stage on both sides. You can find the AIR I in 3 different versions which are equal except for little design differences.
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