Wire Nuts

[def90]

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

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.

[SideShow Bob]

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