For night latch function with pull by others, the 98/99 series mortise exit device should be ordered as NL less trim, e.g., 9875NL-L/TRIM. We will furnish a device only, and the mortise cylinder (not furnished by us unless specified) is simply placed through a hole in the face of the door and then threaded into the mortise lock.
NL-OP suffix is normally used with the 98/99 series rim, surface and concealed vertical rod/cable devices when NL function is desired and pull handle is supplied by others. In that scenario, we supply the 110NL-MD or 110NL-WD when NL-OP is added as a suffix to the exit device model number. The 110NL cylinder assembly is used to mount the rim cylinder to door. The cylinder assembly replaces the rim cylinder mounting plate that normally comes in rim cylinder shipping box. You cannot use the mounting plate that comes with the rim cylinder because it would cause interference with the device master cam rotation.
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