SunStar Restrictor Plate (Required for Input Btu hr Conversion) Fits In:SIS SIU125 or any parts not manufactured 1400R RM2 NG OW3 G9T F12 CH or any parts not manufactured by Metal Fab Inc Size Gas Type Description AV12PCN 12” Natural Gas Polished Chrome Valve Kit AV12PCP 12” Liquid Propane Polished Chrome Valve Kit AV12PBN 12” Natural Gas Polished Brass Valve Kit AV12PBP 12” Liquid Propane Polished Brass Valve Kit AV17PCN 17” Natural Gas Polished Chrome Valve Kit AV17PCP 17” Liquid Propane Polished Chrome Valve Kit AV17PBN 17” Natural Gas Polished Brass Valve Kit AV17PBP 17” Liquid Propane Polished Brass Valve Kit 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