So last year I rebuilt a friends 2 heaters. A 2200 and a 422

The question I have is I noticed that the 422's Burn Pot did not have an extension for the fuel. My 2400 and his 2200 had a tube with a stainless sheath. I hope I didnt mess his 422 rebuild up! These were new parts. On the 2400 you leave the shipping copper nut on the inlet until the burner is upright so the sheath does not fall off (dont ask me how I know)

So it looked like on the 422 the fuel just gets delivered to the edge of the pot and the newer ones the tube drips the fuel more towards the center?