Rugged Radios Rocker Switch Variable Speed Controller (Vsc) for MAC Helmet Air Pumper The Rocker Switch Variable Speed Controller for MAC Helmet Air Pumpers offers a streamlined solution for adjusting air flow with a compact rocker switch design. Functioning both as an on/off switch and a speed adjuster, it provides convenient control without occupying much dash space. Features: Compatibility: Fits MAC Air, Mac-1X, or Mac3.2 Pumper Systems. Switch fits in most standard rocker switch panel holes measuring .830 x 1.45 (21.08mm x 36.83mm) Rocker Switch Variable Speed Controller with integrated waterproof 8 Power Lead and 8 Pumper Lead wiring and plugs 15' Wiring Harness for power and pumper control with waterproof connectors