40-042 lock?

A quick learner from kansas says:
is there a way to lock and unlock this system
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Dave Sr. from SWISCO responded:
The 40-042 has a latch on the inside base of the handle. You slide it up and down to lock and unlock. If you are referring to an exterior key, then take a look at our 40-149. They both have the 3" installation hole centers to mount to your door.
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