A block which transfers heat to allow multiple heat-consuming machines to use the same heat source, or multiple heat sources to power one machine. It loses large amounts of heat over small distance for realism, but the amount of heat lost can be decreased by insulating it with rubber.
Use the existing Copper Block, but add a crafting recipe which adds insulation to it; use existing Copper Cable; or
are Heat Conductors (the existing item)
is a Copper Block
and is, well, Rubber