Are all overhead concealed closers double acting?

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Overhead Concealed door closers are used to provide a more aesthetic look to the opening.  Concealed in either the frame or the door Offer the ability to be adjusted to maintain control o...
The LCN direct retrofit for the Obsolete 303 OHC closer was the 330 series, it was discontinued in 2009. The 3030 closer door closer body can be used as a replacement cylinder. 
The Dor-O-Matic overhead concealed manual door closers have been obsolete since 1999, and there are no parts available for them.
The LCN 6030 is a Double Acting (or dual action) closer. Requires a "Cased Open Frame" - that means no stops formed in the frame.
There is not a conflict between the 4041/4040XP EDA door closer and the GJ 100 or 410 overhead concealed series stops.  The exception is:  the 4041/4040XP mounted on a drop plate, and the Glynn Jo...
Concealed
The date is a 4 digit #. The first 2 numbers indicate the week it was made, and the last 2 numbers indicate what year it was made. On most surface mounted closers, the model #,  date code, ...