Cal Flame Gas Grills Natural Gas Conversion Fittings. BBQ07101045. Outdoor Kitchens. This Cal Flame Natural Gas Conversion Fittings includes everything needed to convert up to a 5-burner gas grill. Includes regulator, orifices and connectors. As of 2008, all Cal Flame hardware products are liquid propane ready as a standard feature. However, a natural gas Conversion Fittings will come with each product for homeowners who want to take advantage of their pre-installed lines.