Waters SYNAPT G2 Operator's, Overview And Maintenance Manual page 210

9. Install 2 clamps on each hose end.
10. Connect the 12.7-mm clear PVC exhaust tubing to the roughing pump
exhaust port NW25 nozzle fitting using an NW25 center ring, and then
secure the connection with an NW25 clamp, using the 7-mm nut driver
to install the clamp.
11. Secure the exhaust tubing with a hose clamp.
12. Route the open end of the exhaust tubing to a suitable exhaust vent.
See also:
(part number 715002097).
13. Make the electrical connections to the roughing pump (see
B-6 External Connections
To avoid gas leaks, use the sharp knife to cut the PVC
Caution:
exhaust tubing squarely (that is, perpendicular to its horizontal
axis).
The instrument requires two separate exhaust systems:
Caution:
one for nitrogen, the other for the roughing pump. Your warranty
does not cover damage caused by routing exhaust lines incorrectly.
See also "Connecting the nitrogen exhaust line" on page
The Waters SYNAPT G2 MS/HDMS Site Preparation Guide
B-10.
page B-7).