O2STEPPED O2 Oxygen Sensor Stepped Style Bung Port Boss Nut Fitting 18mm

Dimensions:    18mm Stepped O2 Port  Large Outside Diameter: 1"  Small Outside Diameter: 13/16" (.8125")  Inside Diameter: 18mm Threaded  Large Diameter Height: 1/4" (.25")  Small Diameter Height: 5/16" (.3125")  Overall Height: 9/16" (.5625")  M18x1.5  Material: Mild Steel  DISCLAIMER!!  We cannot be responsible for improper fitment.  It is standard for most vehicles to use 18mm ports/plugs, however it is your responsibility to verify dimensions to make sure that this part will fit your vehicle.   High quality mild steel is a much better choice than stainless steel for O2 sensor ports and plugs, as it will not contact weld together when heated. This allows you to remove the plug and/or O2 sensor as needed.