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Step 4:
Set the Medicator down and inspect the plunger
seal (J009) for nicks, grooves, or wear.
Step 5:
You can also test by taking the stem and
inserting the plunger and then pulling it out. It should
make a pop sound. If not or if you see damage, it is
definitely time to replace the plunger seal (J009).
Step 6:
Now unscrew and remove the check valve nut.
DM11F Troubleshooting - Part 1