Can I order a 55 series exit device with cylinder only function, no pull (NL-OP)?

Yes, order as follows:

55NL-OP
5547NL-OP
5547WDC-NL-OP
5547WDC-NL-OP-F

The 5547-F is not available with cylinder only function.  The rod design is too heavy for cylinder only operation.

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