I wouldn't use copper but you could use regular black water pipe if you wanted.
I now Walmark sells the parts that goin inside the grill where teh flame is used so I would suggest going that route. That way you can have your lava rocks on top and still fire it up if need to.
I use regular black water pipe to make propane burners to metal aluminum and cast parts.
its unlikely that the propane even in a copper pipe will get that hot but for safty reasons go with steal
I now Walmark sells the parts that goin inside the grill where teh flame is used so I would suggest going that route. That way you can have your lava rocks on top and still fire it up if need to.
I use regular black water pipe to make propane burners to metal aluminum and cast parts.
its unlikely that the propane even in a copper pipe will get that hot but for safty reasons go with steal