Emergency key indicator

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Answer
Hotel/motel lock—Deadlocking latch bolt operated by key outside or rotating inside knob/lever. Outside knob/lever rigid. Rotating turn from inside extends dead bolt and changes visual message on ou...
Hotel/motel lock—Deadlocking latch bolt operated by key outside or rotating inside knob/lever. Outside knob/lever rigid. Rotating turn from inside or emergency key outside extends dead bolt. Both d...
The ND40 does not have this option.  You will need to look at a mortise lock, L9496, or a deadbolt such as the B571.
A flat head screwdriver can be used or the 35-250 emergency key.
The emergency keys are shipped with each lock.  The part numbers are; 61-509 standard and 61-510 large bow size.
Part numbers listed below: