What is the valve on the back of a 4041/4040XP closer used for?

The valve on the back of a 4041/4040XP closer is a "Back Check Selector Valve" that needs to be turned in on "Parallel Arm" mount applications ONLY. If a 4041/4040XP closer mounted "Top Jamb", or "Pull Side", and there is no backcheck, the closer could be defective. Check all templating, and settings.

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