Rocker Switch Variable Speed Controller for MAC Helmet Air Pumper comes with a complete switch and wiring harness. This controller enables easy adjustment of air flow in the pumper without excessive use of dash space. Acting as both the on/off switch and power control for pumper speed, this tool is an essential upgrade for controlling MAC helmet air pumper air flow. Users with existing VSC can opt to buy only the Switch Upgrade. The controller fits MAC Air, MAC-1X, or MAC3.2 Pumper Systems and standard rocker switch panel holes measuring .830in x 1.45in. Included are integrated waterproof 8in Power Lead and Pumper Lead wiring and plugs, plus a 15' wiring harness for power and pumper control with waterproof connectors.