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This Valterra/Diamond Group switch controls a 110V interior lighting circuit and lights up red when it's in the on position, so you can find it in a dark cabin and tell at a glance whether the circuit is live.
It panel-mounts into a standard cutout and uses a Molex connector for wiring, making it a straightforward swap for RVs and other installations using the same connector style.
A simple upgrade if you want to see at a glance whether an interior lighting circuit is powered on.