latch & pull not locking

A quick learner from New Jersey says:
I have a latch and pull similar to the this one. There is nothing for the latch to lock on to. What do I need in order to lock the screen door?
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Paul from SWISCO responded:
Thanks for contacting us. The 83-116 uses a keeper that's either like our 85-001 or 85-011. Check them out and see if either of these look familiar.
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