The Omni system has a specialized design to allow for simple adjustment of flow restriction, allowing complete control of the vapor and air intake ratio. Adjust by simply twisting the mouthpiece, which extends/retracts the condenser into the tip. It is not compatible with the M Tip or body midsections.
This is hands down the best batteryless vaporizer on the market.
It is expensive, but well worth it as the only thing to replace are the o-rings and maybe the screen. If you don't lose it you'll have it the rest of your life.