Waters 2707 Operator's Manual page 68

10. Using the same 2-mm socket-head driver, loosen the upper socket-head
screw 2 turns.
Recommendation:
11. Slide the syringe valve downward, out of the instrument.
12. Remove the syringe valve.
13. Remove the waste fitting at the rear of the valve.
14. Attach the waste fitting of the new valve.
15. Install the new syringe valve with the flat side of the top axle facing
forward.
16. Install the set screws.
3-18 Maintaining the Autosampler
Upper socket-head screw
Lower socket-head screw
Complete no more than 2 turns.