what does nl-OP mean?

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This option is not available as there is no NL cam to directly drive the rods and using a key to lift the heavy stainless, brass or bronze rods would damage the key. 
The 388 Cylinder Control is required for the NL-OP function on a 33A/35A series exit devices. The 110NL is used on 22 and 98/99 series exit devices not 33/35A series devices.
This is possible.  A rim cylinder with cylinder anchor plate is used (anchor plate provided with rim cylinder package). No other special components are required. Order device as NL-OP.&...
The NL-OP function for 25-C uses the 718C trim, so template T-2211 for metal doors and W-2211 for wood doors for 718 trims prior to 2/28/2011. T-2211 for trims prior to 2/28/2011 W-2211 for...
Device would be ordered as a 25C-C as of June 2012. C nomenclature is for the Cylinder. 
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 cyl...