Hi,
Please confirm the model number of the pressure washer?
Looking at this [https://www.toolpartsdirect.com/catalogsearch/result/index/?attribute_set_id=Models&brand=Karcher&q=Karcher+Pressure+Washers+1.107-309.0&search_filter=Default|website] the model you have selected i.e. 1.107-309-0, is not listed but if yours is different then it may be and then hopefully you’ll find the information you need.