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Valve Sticking Open on 20-Year System: Replace Diaphragm

Valve won't close (even manual), stops only when water off — diaphragm worn. Solenoid changed 2 yrs ago (round vs hex top irrelevant).

Fix

ID valve brand/size/model.
Remove bonnet, replace diaphragm.
Match at irrigation supply or irrigationtutorials.com.

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