Norcold (or Dometic) do NOT have a 'high altitude orifice' kit.
The fridge and other LP appliances are metered to operate on 11" WC propane pressure.
At high altitudes the air/fuel ratio is rich (too much fuel not enough air)
A smaller propane orifice might correct the air/fuel ratio enough to get flame to lite off repeatedly BUT may not supply enough btu's for proper heat transfer so that the ammonia can vaporize in perk tube. (stack temp is roughly 350*F)
SO you might end up with a good flame.........low heat and no cooling????
