night latch cylinder assembly

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NL-OP, Night Latch Cylinder Assembly - Optional Pull, Optional Pull
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NLOP means Night latch optional pull (night latch cylinder assembly with pull by others).
The 179CA cylinder assembly contains the parts that need to be put in the exit device to convert it from EO to NL (nightlatch) or HB (hold back) function.
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.
The 17, 18, & 19 devices use the same dogging assembly part #610480.