ROYALTON® - Royalton 80G2, 95G2 1 Lp Conversion Kit - Ensure your ROYALTON 2-stage residential gas furnace operates safely and efficiently by using the model 11K48 natural gas to propane conversion kit. This kit can convert all BTU sizes of ROYALTON brand 2-stage gas furnaces to liquid propane. Please note: this is not a universal kit, do not attempt to use this on any other brand name appliance.