Unit Heater Gas Conversion Kit; Type Gas Conversion Kit, Natural Gas to Liquid Propane; Used On UDAP-225/UDAS-225/UDBP-225/UDBS-225/UDAP-250/UDAS-250/UDBP-250/UDBS-250 Model Standard Power Vent/Separated Combustion Fan and Blower Type Heater Unit Heater; Conversion Type Natural Gas to Liquid Propane Gas