Window balance

A handy person from Ruskin Florida says:
December 1, 2020
I need 4 of these
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Bob from SWISCO responded:
December 4, 2020

Thanks for posting. This looks like either an S600-29 or S900-29 Spiral Balance. The difference between these two spiral balances is the diameter of the outer tube. The Series 600 has a 5/8" outer tube, the Series 900 has a 3/8" tube. Compare both with your old hardware to see what matches best. Let me know if you have further questions. 
30" Series 600 Spiral Tilt Window Balance
30" Series 600 Spiral Tilt Window Balance
S600-30
$9.40
30" Series 900 Spiral Balance
30" Series 900 Spiral Balance
S900-30
$9.25
How to replace a tilt window spiral balance.
How to replace a tilt window spiral balance.
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