What does NLOP mean

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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...
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.&...
You would have to order the device as 88NL less trim, the device will be shipped as an 88EO.  The EO device has an NL cam to accept a rim cylinder tailpiece. 
NLOP means Night latch optional pull (night latch cylinder assembly with pull by others).