16 inch spiral balance

A quick learner from USA says:
For a vinyl double hung window
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Bob from SWISCO responded:

If the outer tube, not including the tip, is 16" long, then this appears to be either an S600-16 5/8" diameter spiral balance, or the 3/8" diameter S900-16. Compare the diameter of your old balance's outer tube to determine which you need. 

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