Hey there! These sash balances are stamped 2730 BSI ON. The aluminum channel measures 28". The full length including the plastic ends is 29".
The only marking on the windows themselves is Duraseal L2 051203.
Thank you for your help identifying these!
Sash balance replacement.
Handy Person from Truckee, CA
Jul 23, 2026 2:26 pm
5 user uploaded images
2 Replies
Bob from SWISCO
Jul 24, 2026 12:59 pm
Hello there. This looks similar to an S350-28 Channel Balance. Please compare. For a stamp choose 2730.
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