Air pump diaphrams are fairly easy to replace.
The video here shows how...
(This is not a Precision air pump, but the procedure is the same)
To suit;
Precision 2500 Air Pump (requires one diaphragm)
and
Precision 7500 Air Pump (requires two diaphragms)
Precision 9500 Air Pump (requires two diaphragms)
Precision 12000 Air Pump (requires four diaphragms)
To replace the flapper valve assembly;
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