sash balancer # BDG 8#31 11 85

A home owner from nyc says:
i have a sash balancer with the # BDG 8#31 11 85. What would be the replacement for it. Thanks
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Mike from SWISCO responded:
Good Afternoon,

That stamp looks a bit different with the pound symbols but I think you need the 24-837 replacement Andersen sash balance.
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