They had several variants on Amazon, but the most useful one with a resettable circuit breaker cost only 5.99. Bought two for the same price. I think it's a smart design that allows you to connect different types of connectors that would normally interfere with each other. I used mine for the kitchen for the oven and fridge so I could also hook up a temporary appliance like a blender, blender, or slow cooker. Worth the price and works perfectly.
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