Vision Metron Hydration Garmin Mount. The Vision Metron Hydration System offers a modular range of small parts designed for aerodynamic performance and rider convenience. Key components include the Metron Rear Hydration System Garmin Mount Labyrinth Spout and various high-grip bottle cages and adapters. These parts are engineered for secure fitment easy integration with existing setups and compatibility across Vision’s hydration platforms making them ideal for time trial and triathlon applications.