Variable Vapor Flow Adjustment just like the OmniVap. This model includes a 14mm Dark Wood, or Light Wood NonaVonG Stem midsection with Omni Mouthpiece assembly. With the 14mm taper built into the stem, it mates perfectly with most 14mm adapters. The Omni system has a specialized design to allow for simple adjustment of flow restriction, allowing complete control of the vapor to air intake ratio. Adjust by simply twisting the mouthpiece, which extends/retracts the condenser into the back end of the tip. It is not compatible with the M Tip or body midsections.