A connecting device (40) for a concealed-type latch of a lock for a panic exit door includes a connecting member (46) having an end (464) operably coupled to a latch (128). A draw rod (48) includes an end (484) pivotably coupled to the other end (462) of the connecting member (46) and pivotable between a first position parallel to the connecting member (46) and a second position perpendicular to the connecting member (46). The connecting device (40) can be installed via an end opening (104) in a top or bottom edge of a door (10) into an interior space (102) of the door (10) with the draw rod (48) in the first position. When the draw rod (48) reaches a side opening (106) of the door (10), it is pivoted to the second position for coupling with a follower device (30) of the lock.