Waters Prep Series Installation And Maintenance Manual page 143

3. Pry the seal out of the pump head with a small screwdriver. Do not
scratch the surface of the pump head.
Caution:
when you remove the seal.
Removing the pump seal
4. Use the seal insertion tool to insert the seal in the pump head:
a. Put the seal onto the tip of the insertion tool so that the open end of
the seal (with the spring) faces out from the end of the tool.
b. Fit the guide into the recess at the rear of the pump head.
The circular opening in the guide is tapered, with one side
Tip:
larger than the other. The larger side of the opening must face you.
Apply methanol to the pump head area for lubrication.
Tip:
Do not damage the seat or score surrounding surfaces
Maintenance procedures 3-59