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I am in the process of fixing an older Nexgrill Model 720-077 grill. It was abandoned at a rental house and I have been working on getting it back to grilling again. The flame height of all main burners do not seem to change very much from the HIGH to LOW settings. I looked into the gas valves to see if there was a low flame setting and there appears to be none. I've replaced the LP hose from the tank from a new one. How high should the flame height be from the HIGH to LOW setting when turning the gas valve. Any ideas will be a great help Joe