Tubes with a diameter slightly larger than the braded wireline or slick line that are used in the stuffing box on a wireline intervention to isolate the well pressure and fluid from the atmosphere. They work in combination with oil or wireline grease injection to form a hydraulic seal. It is absolutely essential that WIRELINE FLOW TUBES arechanged frequently in order to properly contain well pressure as the wireline is raisedand lowered into the well bore.