This genuine OEM Karcher pump repair kit contains all the parts you need to completely rebuild and repair your Karcher pressure washer pump. It also includes a detailed diagram showing where on the pump each piece goes. If you are unsure whether this is the correct repair part for your machine, please send us a message with the model number and serial number of your pressure washer (with a picture of the model number tag if possible), and we will look it up for you.