dosatron D25F - Remove Check Valve Seal; Pry Out Check Valve Assembly; Inspect Check Valve Parts

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Proper protection, such as gloves, eye wear, and aprons, are recommended when disassembling a Dosatron.
D25F Troubleshooting - Part 2
Step 6: Inspect the seal (Part #: J051) and the check valve
assembly (Part #: MPDI122). If they are dirty, you may be able to
soak, brush off, and reinstall. If you see damage or if you don’t
remember the last time you changed these parts, just replace
them now.
Step 5: Then carefully pry the check valve assembly down and out
of the stem. A small at blade screwdriver or pick will make this
easier.
Step 4: Remove the check valve seal (Part #: J051).