SunStar Restrictor Plate (Required for Input Btu hr Conversion) Fits In:SIS SIU125 Size Gas Type Description AV12PCN OPT RGLPC48FSEN SLV LP 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 KEY BENEFIT: Maintain a comfortable ambiant temperature while also utilizing any excess heat in other areas of the home 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