Installation instructions are NOT included with this part! Up for sale is the Thermistor that originally shipped with the following Samsung Washing Machines: WF405ATPAWR, WF405ATPAWR/A2, WF405ATPAWR/AA, WA52M8650AW, WA52M8650AW/A4 This part helps to monitor and regulate the water temperature. This is a NEW and True Samsung Part! This offering is for ONE Unit. If you don't see your model number -- Please send us a message so we can help you to select the correct item. We are happy to help!