Robert R Jackson , NJ October 24, 2014 Appliance: General Electric Gas Range JGBP85DEM2WW Ge Range Jgbp85dem2ww: Convert ge range from propane to natural gas. How to replace Orifice Holder. Replaced all 4 Orifice holders with orifice for natural gas.The range was set up for Propane.once the top was removed it took about 45 min. to replace them and put the top back together. All I can say is that it is a good thing that ApplianceParts Pros had what I needed a local supplier told me that as per GE the parts was unavailable. the only other thing I had to switch over was the gas regulator.which is done by flipping over the brass fitting on the regulator. 2 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes