Installing hanging heater

[Dragster Racer]

I did a search, and looked at some other threads, but I still need help.

I bought a used propane hanging heater, that seems to work well. It hangs by two threaded rods. Plenty strong, but it sways. I haven't run the has line or exhaust yet. I know I have to take care of keeping it from swaying. It won't take hardly anything. I could put in a strap to the wall. I could run a thin cable to the ceiling diagonally with a turn buckle. I even wondered if the gas line needs to be flexible, or if I can use solid all the way to the heater, and that would double for stabilization? (I wouldn't ask if I wasn't sure.)

Also, the tank is set and trenched. The installer ran the line up about 4' on the wall outside. I assume that the second supplied regulator has to go that far up? On the outside? Then cauk and use some sort of a trim ring for going through the metal?
The pictures I saw doing the search showed line coming in, then a t up and down with the down leg being capped, and having a shut off. Is this needed? Also, the lp guy left the copper tubing maybe 1/2" open. Is there a special fitting for that for going into the new regulator? And on the black pipe for inside, do I use the special teflon tape? I have not done lp install before, and want to do as much as possible before the installer comes back to leak check and initial fire up.

 

[rasit]

I'm no expert and hopefully others will chime in, but you should eliminate the sway. Unistrut or angle iron would be my first choice. Look how your garage door rails and/or opener are stabilized as reference. Do not depend on the piping for stability and I would think a short piece of flexible would be in order.
The shut-off valve should be on the horizontal feed before the tee or on the vertical pipe heading up to the heater. The down pipe with the cap is to catch condensation, I think it's called a drip. There is a special pipe dope that is used on black iron for gas installations, no teflon tape here.