cylinder falcon nl-op

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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. 
The Falcon Monarch 510L and 510L-NL trim will accept either a 1 1/4" Mortise cylinder with a straight cam or a 1 3/8" Mortise cylinder with a straight cam using the blocking ring provided with the ...
Device would be ordered as a 25C-C as of June 2012.
A 1-1/8 through 1-1/2" mortise cylinder with straight cam per Step 4 of 512NL Instructions.
Order the device as 88 NL less trim. The cylinder will be mounted to the face of the door. Use templates 10156 and 40015.
NL-OP, Night Latch Cylinder Assembly - Optional Pull, Optional Pull
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.