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“ part number for concealed top latch ”

Resolution: Yes, the top latch for the 25-V carried over from the 18-V device. Surface vertical rod top latch = part #650389 or #650375(fire rated):

Resolution: The old style Von Duprin 3327 top latches and rods are no longer available. The part number for the old 3327 top latch was 105339.:

Resolution: The top latch for a Fire rated surface vertical rod device is part #650375-00 which replaced the old part #F588.:

Resolution: The part number for 98/9927/F top latch less cover is 050400.:

Resolution: The part number for 5547 top latch and rod assembly is 050053-00. :

Resolution: 050090 for bottom latch retrofit kit and 050091 for top latch retrofit kit.: