SunStar Restrictor Plate (Required for Input Btu/hr Conversion)The SunStar Gas Valve Kit is to be use with Gas Conversion Kit to convert Input Btu hr. You can choose the model heater and Btu hr input that you wish to convert. *IMPORTANT: Heaters can be converted only to Btu hr capacities that are available in the same tube length. In addition, the 50 and 75 MBtu hr heaters use a smaller burner and cannot be converted to larger than 75 MBtu hr. Conversely, the 100 through 175 MBtu hr heaters cannot be converted to