Monitor Heater GF3800 LP Orifice Part # 6658
 
Part # 6658
Fits:  GF-3800
 
This part is for LP gas in altitudes up to 2000 feet.  You also need the LP standard air damper, part # 6655.  
If your altitude is over 2000 feet, you will need different parts for your installation.   
 
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