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Back Check Selector Valve purpose
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Answer
What is the valve on the back of a 4041/4040XP closer used for?
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: