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How to remove a glass from a garbage disposal
Disconnect your garbage disposal appliance from the main power source.
This is to ensure it's not switched on by accident while you're removing the glass, which could result in serious injuries.
If you can see its connection to the power outlet, simply unplug the power chord.
Otherwise, break the power connection at the fuse box or circuit breaker. Remove any large pieces of glass with a pair of pliers.