Ports Have a Hi-Vac Single Oblique Glass Stopcock To a Tapered Inner Joint. Spaced Approximately 110mm Apart. 19/22 Top Joint Is For a Vacuum Gauge. Main Stopcock Has 8mm Bore and 35/25 Socket Ends. 35/25 Ball O-ring Stopper Plug and Pinch Clamp Are Supplied. Vacuum Grease Is Recommended.