Rocker Switch Variable Speed Controller (VSC) for MAC Helmet Air Pumper - Switch Upgrade Only is an upgrade for your existing VSC, allowing you to conveniently install it in your Rocker Switch panel. This requires wiring from the current VSC and is a direct replacement, providing easy access to pumper controls without using up valuable dashboard space. The switch functions as the power control and the on/off switch for the pumper speed, making this switch upgrade essential for those using our VSC. It is compatible with MAC Air, MAC-1X, or MAC3.2 Pumper Systems already wired for a VSC. The switch fits in standard rocker switch panel holes measuring .830in x 1.45in. It comes with an integrated waterproof 8in Power Lead and 8in Pumper Lead wiring and plugs.