For oil return line flanges with female thread for push-on hose Screw-in adapter for oil return line Screw-in adapter with 1/2" NPT male thread For oil return line flanges with female thread for push-on hose For easy hose assembly of 16-18mm hoses to our oil return line flanges with inner thread. Fits to oil return line flanges of T- and GT-turbos with inner thread. Material: Aluminum Thread: 1/2" NPT male Total height: 50mm Important advice: The feed line should be at least Dash 4 diameter. The return line should be at least Dash 10 or at least 16mm inner diameter!