WHAT CYLINDER BLOCKING RING FOR KR MULLION

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Answer
Key removable option is not available for any of Von Duprin aluminum mullions.
1 1/8" mortise cylinders fit the 650 series keyswitch.  The 650 series keyswitch when ordered with the cylinder, will come complete with the correct cylinder, cam, and any required blocki...
If blocking rings (PN 36-079) are needed, specify dimensions when ordering. See below for blocking ring (PN 36-079) dimensions.  Blocking Ring  Specify Dimension  1//8" ...
Von Duprin KR (key removable) mullions requires a 1-1/8" or 1-1/4" mortise cylinder with the standard straight cam, the cam is not inverted. Please see chart below for part numbers. 
instructions
The KR4023 mullion requires a 1-1/4" mortise cylinder with straight cam. This is stated in box 7 on the first page of the KR4023 mullion instructions.
4754, 4854 and the 9854 are electrified mullions and handed as noted below: 4754 is not handed: Prepared for two 4263 monitor strikes. Use with all Von Duprin rim panic devices 4854 is han...
The KR54-F is used on electrified mullions (panic and fire) because it has a route for the wires.
The Von Duprin electrified steel mullions, 4854 and 9854 come with a quick connector that connects the electric strike wires from the mullion to the frame through the top fitting.  ...