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“ Back check selector valve if not screwed in, ramifications? ”

Resolution: 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. :

BACKCHECK SELECTOR VALVE

Resolution: Valve used to provide proper backcheck location for 4040XP and 4050A parallel arm mounting:

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“ Back check selector valve if not screwed in, ramifications? ”

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