How-to
Dilution dispenser acting up?
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If you cannot push down the piston do not apply force!
It is likely that one or both of the internal ejection valves are jammed.
To resolve this issue, please consult the Instructions Manual included with the device, especially section 13 on general trouble shooting and section 10 on how to remove the valves from the device. Possibly you don't need to replace them, just clean them and make sure they move freely.
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