To convert a JNR, WNK or TJK from on gas type to another you will need to replace the entire valve assembly (which includes the correct orifice). If you were only to only change the orifice on your valve, you will not have control over the variable heat settings on your grill because internally the valves are tooled differently per gas type. Your grill will burn on high at all times and you will not be able to turn it to low. If you are unsure, please contact our knowledgeable staff to determine which conversion kit you will need for your conversion.