BDM Chim A Lator 8" x 18" Black Galvanized Steel Spark Arrestor With 3 4" Mesh 409 stainless steel The package also includes a RF transmitter and receiver The package also includes a whistle free flex line Product Code Part No Size 1730022 3DWC 2 3"x2' Double Wall Flex Connector 1730033 3DWC 3 3"x3' Double Wall Flex Connector 1730044 3DWC 4 3"x4' Double Wall Flex Connector 1730066 3DWC 5 3"x5' Double Wall Flex Connector 1740022 4DWC 2 4"x2' Double Wall Flex Connector 1740033 4DWC 3 4"x3' Double Wall Flex Connector 1740044 4DWC 4 4"x4' Double Wall Flex Connector 1740066 4DWC 5 4"x5' Double Wall Flex Connector 1750022 5DWC 2 5"x2' Double Wall Flex Connector 1750033 5DWC 3 5"x3' Double Wall Flex Connector 1750044 5DWC 4 5"x4' Double Wall Flex Connector 1750066 5DWC 5 5"x5' Double Wall Flex Connector BDM will replace or repair and even most acids