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This DC indicator light mounts into a .550 in x 1.125 in panel cutout and glows red whenever the circuit it's wired to is energized. It's rated for 10 Amps at 14 VDC and connects with 2 terminals, making it a simple add-on for monitoring lighting, water heater, water pump, or other appliance circuits.
A small, panel-mount way to confirm a 12-volt circuit is live without opening a compartment to check.