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The heavy duty Contour Master Switch is designed for larger vessels with higher amp loads. The switch can be recess mounted in a 85mm hole or surface mounted. Screw holes 5mm roundhead. Interchangeable labelling system on the control knob allows a full range of applications. Switches come standard with the battery symbol label. Removable rear cover insulates the rear terminals against any short circuits and ensures the switch meets ABYC requirements. Non corrosive construction, self cleaning sliding contacts. Ignition protected.