The Schlage L9000 Series mortise locks are NOT compatible with Falcon and Von Duprin mortise exit devices.
Falcon mortise exit devices (25-M/F-25-M) use the 8500NL mortise lock.
Most Von Duprin mortise exit devices (98/9975, 8875, 5575) use the 7500 mortise lock.
The Von Duprin 94/9575 exit devices use the 7500-IN mortise lock..
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