Thermocouple Flow Sensor Head With 40" Tube And 3/4" Cam Lock Connector This item was purchased from a large business inventory reduction sale. I do not know the history of it. It is in good cosmetic condition with just normal wear. The tube is about 3/4" OD. The larger hole on the head is about 1" ID X 1 1/4"OD and the smaller hole is about 3/4" ID with an o-ring type seal on the inside. I am not able to test it. It only comes with what is shown in the pictures. I have more than one of these and so the one you receive may not exactly match the pictures, but it will be in the same condition. Q3-3 d bin rl fdk 80702228