Replacement Window Balance Device

Home Owner from 92130
The window balance mechanism says "27 3 B.S.I. 0B" The metal rod excluding the end pieces measures 28 inches in length.
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Bob
Bob from SWISCO
SWISCO
Expert

Thanks for posting. This looks like it might be either an S380-28 or S385-28. The only difference between these two balances is the 'depth' of the bottom nylon shoe, or 'heel-to-toe' measurement. See the diagram below for reference. Measure the depth of your old balance's shoe to see what matches best. In either case, for a stamp option choose 2730.

Comparison of the S378, S380 and S385 balance shoes.
Comparison of the S378, S380 and S385 balance shoes.

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