M18 X 1.5 Mm To M12 X 1.25 Mm M18 x 1.5 MM to M12 x 1.25 MM Exhaust O2 Oxygen Sensor Spacer Reducer Adapter Connector Acceories Number: JXSS017B Weght: 35g Color:Silver Material: Steel Packing: opp bag Size: M12X1.25 to M18X1.5 Product include: 1*adapter+1*copper washer * Adapters Reduce O2 Sensor Ports Plugs Bungs 18 mm to 12 mm - Fitment:18 mm to 12 mm O2 Sensor Universal Exhaust Pipe - Application:Threaded outer and inner adapters reduce O2 sensor port from 18 mm to 12 mm allowing riders to use our exhaust pipes on select newer-model motorcycles - Package: 1pcs Ports Bungs * O2 bung reducer adapter. Coverts M18x1.50 O2 sensor thread port to the smaller M12x1.25 thread pitch. * Commonly used for Nian SR20DET motor with aftermarket exhaust turbo elbow that normally comes with the bigger O2 sensor thread hole when using with the smaller O2 sensor. * Performance Parts Steel Bung (M18 x 1.5 mm to M12 x 1.25 mm) is used for placement of a O2 sensor in the vehicles exhaust system. * The bung is welded into the exhaust and the O2 sensor (Narrowband or Wideband) screws into the bung allowing the sensor tip to be exposed to the exhaust gas in the pipe. Out SZRH A-F