Adjustable plastic cooling tubes are suitable for machine tools, hydraulic machinery, and CNC machine tools for oil and water cooling systems. These products are hand-assembled, allowing for adjustable lengths, interchangeable nozzle diameters in round and flat shapes, and a free rotation of direction. They feature attractive appearance, large oil capacity, non-conductivity, corrosion resistance, and high-temperature resistance. The engineering plastic cooling tubes are made of nylon 66, with outlet nozzles available in round, flat, and large-diameter round shapes. Both types of cooling tubes are used for machine tool hydraulic machinery, and CNC machine tools for oil and water cooling systems.