Waters Autospec Premier Operator's Manual page 193

4. Close the source lock latch, by turning it clockwise. Ensure that it is
fully in line with the source handle.
5. Close the vent valve, on the left-hand side of the source lock, by turning
it fully clockwise.
6. Open the source lock pump valve, on the right-hand side of the source
lock.
Source maintenance 7-35