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Proper protection, such as gloves, eye wear, and aprons, are recommended when disassembling a Dosatron.
Step 4:
To inspect the check valve parts, hold the assembly
and twist the white top guide one quarter turn counter
clockwise to remove.
D8RE2 Troubleshooting - Part 2
Step 5:
Remove the spring and cone.
Step 6:
Inspect all of the check valve parts. If they are dirty, you
may be able to soak, brush off, and re-install. If you see damage
or if you don’t remember the last time you changed these parts,
just replace them now (Part #: PJDI118).