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This in-line switch from Diamond Group is built for high-current circuits, with a 40 amp rating and a 5-pin DPDT configuration that suits slide-out and other accessory wiring.
It's compact at 1.63" x 0.82" with a matching 1.50" x 0.70" cutout, so it fits into standard RV panel openings without much modification.
Its high amp rating makes it a solid choice anywhere you need a reliable in-line switch on a heavier-duty 12-volt circuit.