The Von Duprin 4754, 4854, 9954, and 9854 mullions can be converted or ordered with key removable option.
KR54-F kit is the conversion kit to convert the above mullions to key removable mullion.
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.