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Proper protection, such as gloves, eye wear, and aprons, are recommended when disassembling a Dosatron.
D14MZ3000 Troubleshooting - Part 1
Step 19: Align the notches in the lower part of the blue body with
the two teeth on the top of the injection stem assembly.
Step 21: Now, slide the hose into the barb and
hand-tighten the nut.
Step 20: Then, thread on the injection stem nut, hand tight.