Lost my key

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All lock cylinders on a specific project are operable by a special "project key".  Duplicates of this key may be assigned by the building contractor to workmen and subcontractors as required. ...
Conventional Cylinders - A conventional cylinder is one that requires some breakdown of the lock in order to be removed. These are the most commonly used cylinders sometimes called key-in-lever...
LCN closers are listed by series # and an ordering #.  In this case 4040 tells us the series and 4041 is the ordering # which states the closer is an adjustable size 1-6 sp...