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Proper protection, such as gloves, eye wear, and aprons, are recommended when disassembling a Dosatron.
Step 10: To change, roll the seal off and install the new
one.
Step 11: Pick up the black stem, unscrew and remove
the check valve nut.
D14MZ2 Troubleshooting - Part 1
Step 12: Pull the check valve straight out. It may be a bit
snug, but it will slide out.