Searching for D188#31884

A quick learner says:
Window balance.
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Casey from SWISCO responded:


Take a look at our 24-837 Andersen sash balance, which will replace the 8#31 stamp on your original assembly. Thanks for posting! 

A quick learner from Finleyville pa. says:
Ok, is there a left and right balance or does the one work for both sides?
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Casey from SWISCO responded:

For this particular balance, you'd use the same one on both sides of the window. 

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