Anderson casement window tandem locks.

A quick learner from Racine, WI 53404, USA says:
Can you tell me if the 29.5 inch double lock is the correct one for this window? Lock is on the right hand side. It is a tandem lock.
Thank you for your help

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Emily from SWISCO responded:

Hi, Barry.

I'm afraid I can't tell what you have while your lock is still installed but we do carry the 38-148 and 38-149 Andersen tandem locks. Look these over and see if they match what you need.

Anatomy of a casement window
Anatomy of a casement window
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