Wire Nuts

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Originally Posted by hobowh

Forgot on Blue these are generally gell filled for underground wiring or specialty for connecting aluminum to copper depending on markings etc or if really small for 2 22 gauge wires as mentioned above just to make it more confusing

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Those are different, they are a light blue. The regular ones are dark blue and pretty small, they mostly used for low voltage stuff like furnace/thermostat wires and so on.

Here’s a picture of the wire nuts in ascending size, left to right.