I have to move my stove to the other side of my kitchen for a couple of
weeks due to construcion. It is electric, and from what I can tell,
220v extension cords don't exist. .

I plan to disconnect the 220v wall plug, wire in a 20 foot jumper
section of #6 cable, then re-attach wall plug to end up jumper. Will
run temporary wire under kitchen floor/on basement ceiling.

My questions is this, are there #6 wire nuts, or so you use a different
technique to connect #6 wire?