Balanced swiveled membrane first stage, with 5 low pressure ports (one on top) and 2 high pressure ports. Only available with 230 Bar DIN screw. Part No: 10110 Balanced membrane first stage, with 5 low pressure ports (one on top) and 2 high pressure ports in diffrent angles to suit diffrent configuratios Only available with 230 Bar DIN screw. Part No: 10120