I have an outdoor 240v disconnect with 6awg cable (red/white/black/green) running from the main breaker to this disconnect box. There's a 110v GFCI-protected branch circuit that goes to some wall sockets. The 240v is for a hot tub about 6' away.
We're building a deck and now want to move the hot tub about 20' further away. I do not wish to buy and pull all new cable from the main breaker to the new location, so my idea is to swap out the disconnect and replace it with what amounts (I guess) to a junction box, except the 4x 6awg cables would be joined inside (no switches). Except I'm struggling to find a suitable box - well, I can find boxes, and I can find butt splices, but I would feel more comfortable with four sets of terminal blocks that I just screw the eight wire ends into, and those terminal blocks be attached to the box.