Waters SYNAPT G2 Operator's, Overview And Maintenance Manual page 183

Caution:
Once the fitting is tightened, give the tubing a gentle tug to ensure
it is gripped correctly.
8. Using a long "finger tight" PEEK nut and 1/32-inch, PEEK ferrule,
connect the red, 1/32-inch, 200-mm, PEEK tubing from port 4 of the
LockSpray selector valve to the left-hand side of the flow sensor, where
you use the 1/32-inch, 6-40 Valco compression fitting assembly.
A
A
B
B
C
C
Long "finger tight" PEEK nut and 1/32-inch, PEEK ferrule
1/32-inch, 6-40 Valco compression fitting assembly
The narrower, 1/32-inch tubing can slip out of the port.
Flow sensor
C
B
A
Wa ters
C
B
A
Replacing the IntelliStart Fluidics tubing 5-105