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Marpac Ultima Switch Quantity in Basket: None Code: 5833 Price: $29.69 Shipping Weight: 1.00 pounds Quantity: Turns on when it senses 2" water level and turns off when water is below 3/4" Capacity: 20A @ 12 OR 24V DC. Ignition protected. No moving parts, completely sealed. No metal contact points. Caulked wires prevent wicking.