This kit contains a M12x1.5 Adapter to mount a VDO150 Deg C (300 Deg F) temperature sensor in a sump or gearbox. Comes with a copper washer. The fitting is reasonably thin walled and care must be take not to strain the plug at all. It is recommended to fit the temperature sensor in the plug with a bit of loctite. The fit the plug in the sump or gearbox housing.