The Dometic thermistor with part number [phone removed] is primarily listed for NDR and RM refrigerators, but it is also used in the CFX345 portable cooler/freezer according to the official Dometic parts diagram. Therefore, this is the correct replacement thermistor for your CFX345 unit. Currently, we had one unit in stock, but it sold recently and is temporarily out of stock. We are actively working to restock this part and can notify you when it becomes available. For ordering, please verify the part number directly from your unit or manual to ensure compatibility. When ready to purchase, you can use code ALIRVP for $5 off your order. If you need further assistance or alternative options, feel free to contact us.