28" spiral balance for tilt window

A quick learner from New York says:
January 23, 2023
How do I determine whether to order series 600 or 900? My existing balances only have one "t" at each end. The tip is red.
Thank you for your assistance.
Thumbnail of the uploaded file named IMG_2128.jpeg
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Casey from SWISCO responded:
January 24, 2023

Hello,

You would need to determine the diameter of the housing tube to choose between the (3/8") S900-28 and (5/8") S600-28 spiral balances for tilt windows. Thanks for posting. 

How to measure the tube width of a spiral balance.
How to measure the tube width of a spiral balance.
28" Series 600 Spiral Tilt Window Balance
28" Series 600 Spiral Tilt Window Balance
S600-28
$9.28
28" Series 900 Spiral Balance
28" Series 900 Spiral Balance
S900-28
$9.10
How to replace a tilt window spiral balance.
How to replace a tilt window spiral balance.
VIDEO
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How to Identify a Replacement Spiral Balance
How to Identify a Replacement Spiral Balance
VIDEO
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How to choose the proper spiral balance tip color
How to choose the proper spiral balance tip color
GUIDE
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How to adjust a spiral balance on a tilt window
How to adjust a spiral balance on a tilt window
GUIDE
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