HomeFlex HFHC-88-18 Heater Connector, 3/8-Inch FIP x 3/8-Inch FIP x 18-Inch HOME-FLEX heater connectors can be used to connect gas furnaces and similar demand appliances Constructed from high quality 304 stainless steel with zinc plated steel tube nuts Assembled connector is 18 in. long Flare by female adapters included Approved for use with natural gas or liquid propane