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So to convert this cooktop, you don't need to replace the orifice. all you need to do is remove the burner cartridge or grill cartridge and locate the brass orifice coming from the control panel which the gas lines coming from the cartridge slide over. Just tighten these orifices down further, as tight as they will go. That is how you convert this cooktop. 1/4 turn can be the difference between LP and NG conversion so keep tightening until the flame is the correct size.
Once the flame is the correct side, you just adjust the shutters on the end of the gas lines coming from the cartridge to adjust the amount of yellow or oxygen going into the burner.
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