Answer Hello Geneva! To convert back to NG you'll need to purchase the orifices. For the medium 1.50MM burners use part number WB28K10022, for the small 1.07MM burners use part number WB28K10029, and for the large 1.68MM burner use part number WB28K10030. Thanks. Read More... Answered by AppliancePartsPros.com | Monday, September 9, 2013