Hedman Hedders 21134 Oxygen Sensor Header Reducer 3 in. Collector To 3 in. Exhaust Tube Size Ball And Socket Sold Individually Oxygen Sensor Header Reducer HEDMAN 21134 3in To 3in Collector W/O2 Sensor Bung B&S Dimensions in Inches (LxWxH): 6 x 6 x 4.3