Window Sash metal catch 1 1/4"

Thanks for reaching out! The small metal catch is referred to as the take out clip. This helps to secure the balance in place when attempting to remove the sash. I am confident that this is what you'll need.

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We do not carry a plastic stopper like the on you have here, however, our 55-043 may be worth considering as a replacement. Look over the dimensions to determine if this will be a fit for you.

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Profile view of 55-043