This doesn't make any sense to me...
If it were the RHD heater connect, why would it be on the exhaust side of the engine? All the HVAC equipment is on the exhaust side on a LHD car, in a RHD car its all on the intake side. There is a line, just like the one shown, in LHD cars that is supposed to be capped... on the intake side, not the exhaust.
This is only going from the EPC diagram... off hand I don't remember what my own car has, LOL.