QEL RX switch?

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The attached table shows the part numbers for LX-RX and LX-RX-LC switches field installed.
The QEL conversion kit (3' or 4') and the RX switch kit (050251-00) can convert the 9927 to QEL-RX9927 device.
For Chexit devices with solenoid driven shipped from the factory prior to 8-24-2015, the RX switch is ordered as a "Special CX RX Switch".  It may only be installed or adjusted ...
The RX switch is activated at approximately 18 degrees of lever rotation. 
The Request for Exit (RX) is available on the 55 and 88 Series Von Duprin devices.The RX switch is installed in the end case of 55 and 88 series exit devices.There is no kit to field install the RX...