Spiral balance size.

A handy person from Michigan says:
You are out of stock of the green spiral balance I need. The window is 20 lbs. I'd really like to get these replaced before it gets any colder. Would the yellow work?
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Bob from SWISCO responded:

If the window weighs exactly 20 lbs, then the Red Tip option for the S900-26 should work for you. This supports a window sash in the weight range of 10 through 22 lbs. Let me know if you have further questions. 

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