Description MARES DUAL 15X Features 15X First Stage The 15X first stage is compact in design and made with a sandblasted finish making it scratch resistant to maintain both form and function. This first stage features one Dynamic Flow Control (DFC) port and other pre-oriented ports making it suitable for octopus configuration. Dual Second Stage The Dual second stage is made from ultra-lightweight and ultra-strong technopolymer. This second stage features a Vortex Assisted Design (VAD) and a “curved” bypass which allows for unobstructed airflow and consistent natural breathing at any depth. Also, it features a large, user-friendly purge button for easy use, even while wearing thick gloves.