Greetings, I am connecting an electric heater in my garage that requires #6 gauge wire on a 60 amp double pole breaker. I want to use a whip from the disconnect to the heater, which is a distance of about 4 ft simply for the flexibility. My problem is that I can't find a 6 gauge whip. Are these available or illegal for this application? Could I make my own or should I just take the more difficult route and do it all with metal conduit like the rest of the run. I am using 1" emt with 2 wires and a ground for the whole run from the panel to the disconnect. I thank you in advance for your reply.